Laravel admin panel blank page and not responding [closed]

I’m having a problem in the admin panel. This is the first time it happens to me and I can’t find the solution. Admin panel is connected to database. When I add an article from the admin panel, I encounter a blank page. I will add the photos to the description.

This is the part where I update and add articles and so on in the admin panel:
admin panel image

As soon as I press the save button, a blank page appears. Normally, a green warning should appear before me.
after save image

The green warning that will appear is as follows, but it definitely does not appear.
success warning

I am attaching the backend codes below.

This is index.blade.php code screen.

@extends('backend.app')
@section('content')
    <div class="m-alert m-alert--icon m-alert--air m-alert--square alert alert-dismissible m--margin-bottom-30" role="alert">
        <div class="m-alert__icon">
            <i class="flaticon-exclamation m--font-brand"></i>
        </div>
        <div class="m-alert__text">
            Bu bölümden sitenizin haberlerini yönetebilirsiniz.
        </div>
    </div>
    <div class="m-portlet m-portlet--mobile">
        <div class="m-portlet__head">
            <div class="m-portlet__head-caption">
                <div class="m-portlet__head-title">
                    <h3 class="m-portlet__head-text">
                    Haberler
                    </h3>
                </div>
            </div>
        </div>
        <div class="m-portlet__body">
    <!--begin: Search Form -->
    <div class="m-form m-form--label-align-right m--margin-top-20 m--margin-bottom-30">
        <div class="row align-datas-center">
            <div class="col-xl-8 order-2 order-xl-1">
                <div class="form-group m-form__group row align-datas-center">
                    <div class="col-md-4">
                        <div class="m-input-icon m-input-icon--left">
                            <input type="text" class="form-control m-input" placeholder="Search..." id="generalSearch">
                            <span class="m-input-icon__icon m-input-icon__icon--left">
                                <span>
                                    <i class="la la-search"></i>
                                </span>
                            </span>
                        </div>
                    </div>
                </div>
            </div>
            <div class="col-xl-4 order-1 order-xl-2 m--align-right">
                <a href="{!! url('admin/news/trash') !!}" class="btn btn-danger m-btn m-btn--custom m-btn--icon m-btn--air m-btn--pill">
                    <span>
                        <i class="la la-trash"></i>
                        <span>
                            Çöp kutusu
                        </span>
                    </span>
                </a>
                <a href="{!! route('news.create') !!}" class="btn btn-primary m-btn m-btn--custom m-btn--icon m-btn--air m-btn--pill">
                    <span>
                        <i class="la la-plus"></i>
                        <span>
                            Yeni
                        </span>
                    </span>
                </a>

                <div class="m-separator m-separator--dashed d-xl-none"></div>
            </div>
        </div>
    </div>
    <!--end: Search Form -->
    <!--begin: Datatable -->
    <table class="m-datatable" id="html_table" width="100%">
        <thead>
            <tr>
                <th>
                    ID
                </th>
                
                <th>
                    Haber
                </th>
                <th>
                    Oluşturma Tarihi
                </th>
                <th>
                    Düzenlenme Tarihi
                </th>
                <th>
                    Status
                </th>
                <th>
                    İşlemler
                </th>
                
            </tr>
        </thead>
        <tbody>
            @foreach($datas as $data)
            <tr>
                <td>
                    {{ $data->id }}
                </td>
                <td>
                    {{ $data->title }}
                </td>
                <td>
                    {{ $data->created_at }}
                </td>
                <td>
                    {{ $data->updated_at }}
                </td>
                <td>
                    @if($data->status=='active') 4 @else 6 @endif
                </td>
                <td data-field="Actions" class="m-datatable__cell">
                    <span style="overflow: visible; position: relative; width: 110px;">
                        
                        <a href="{!! url('admin/news/'.$data->id.'/edit/') !!}" class="pull-left m-portlet__nav-link btn m-btn m-btn--hover-accent m-btn--icon m-btn--icon-only m-btn--pill" title="Düzenle"><i class="la la-edit"></i></a>

                        {!! Form::open(['method' => 'Delete', 'route' => ['news.destroy', $data->id], 'id'=> 'deleteID'.$data->id ]) !!}
                        <button type="submit" value="deleteID{{$data->id}}" class="delete m-portlet__nav-link btn m-btn m-btn--hover-danger m-btn--icon m-btn--icon-only m-btn--pill"><i class="la la-trash"></i></button>
                        {!! Form::close() !!}

                    </span>
                </td>
            </tr>
            @endforeach
        </tbody>
    </table>

    <!--end: Datatable -->
</div>
    </div>

@section('js')
    <script src="/backend/assets/demo/default/custom/header/actions.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/forms/widgets/bootstrap-switch.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/base/sweetalert2.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function(){
            $('.delete').click(function(){
                var action = "#" + $(this).attr('value');
                Swal({
                  title: 'Emin misin?',
                  text: 'Bunu silmek istediğine emin misin?',
                  type: 'warning',
                  showCancelButton: true,
                  confirmButtonText: 'Evet!',
                  cancelButtonText: 'Hayır'
                }).then((result) => {
                  if (result.value) {
                    Swal(
                      'Silindi!',
                      'Silme işleminiz başarı ile gerçekleştirildi!',
                      'success'
                    )
                    setTimeout( function () { 
                        $(action).submit();
                    }, 600);
                  } else if (result.dismiss === Swal.DismissReason.cancel) {
                    Swal(
                      'İptal edildi',
                      'Silme işleminiz iptal edildi, içeriğiniz güvende!',
                      'error'
                    )
                  }
                })  
                return false;
            });
        });
    </script>
@endsection

@section('css')
    <link href="/backend/assets/custom/css/style.css" rel="stylesheet" type="text/css" />
@endsection

@endsection

Form.blade.php code screen.

@if(request()->route()->action['as']=='news.edit')
{!! Form::open(['url' => 'admin/news/'.$datas->id, 'method' => 'PATCH', 'enctype' => 'multipart/form-data', 'class'=>'m-form m-form--fit m-form--label-align-right']) !!}
@else
@php($meta_title = 'Lorem Ipsum is simply dummy text of the printing and typeset')
@php($meta_desc  = 'Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries')
@php($datas = ['location'=> null,'en_title'=> null,'date'=> null, 'en_body'=> null, 'sort'=> null, 'category_id' => 0, 'created_at' => null, 'slug' => null, 'title' => null, 'body' => null, 'video' => null, 'status' => null, 'cover' => null, 'meta_title' => $meta_title, 'meta_image' => 'http://via.placeholder.com/600x315', 'meta_description' => $meta_desc])
{!! Form::open(['route' => 'news.store', 'enctype' => 'multipart/form-data', 'method' => 'POST', 'class'=>'m-form m-form--fit m-form--label-align-right']) !!}
@endif

<div class="m-portletx">
   <div class="m-portlet__body">
      <ul class="nav nav-pills nav-fill" role="tablist">
         <li class="nav-item">
            <a class="nav-link active" data-toggle="tab" href="#genel">
               Genel
            </a>
         </li>
         <li class="nav-item">
            <a class="nav-link" data-toggle="tab" href="#galeri">
               Galeri
            </a>
         </li>
         <li class="nav-item">
            <a class="nav-link" data-toggle="tab" href="#seo">
               SEO
            </a>
         </li>
      </ul>
      <div class="tab-content marginTop-40">
         <div class="tab-pane active" id="genel" role="tabpanel">
            
            <div class="form-group m-form__group row">
               <label class="col-xl-3 col-lg-3 col-form-label">
               Kategori :
               </label>
               <div class="col-xl-9 col-lg-9">
                  <select selectedvalue="{{ $datas['category_id'] }}" name="category_id" class="form-control m-input type" >
                     <option value="0">Seçiniz</option>
                     <option value="1">Haber</option>
                     <option value="2">Yayın</option>
                     <option value="3">Video</option>
                  </select>
                  <span class="m-form__help">
                  Ait olduğu kategoriyi seçin.
                  </span>
               </div>
            </div>
            {{
            Form::bsText(
            'title',
            'Başlık',
            'İçeriğinizin başlığı en az 3 ve en fazla 255 karakter olmalıdır.',
            $datas['title']
            )
            }}
            <div class="form-group m-form__group row">
               <label class="col-xl-3 col-lg-3 col-form-label">
                  Açıklama :
               </label>
               <div class="col-xl-9 col-lg-9">
                  <textarea name="body" class="form-control m-input summernote" >{{$datas['body']}}</textarea>
                  <span class="m-form__help">
                     İçeriğinizi bu alana yazın
                  </span>
               </div>
            </div>

            <div class="form-group m-form__group row">
               <label class="col-xl-3 col-lg-3 col-form-label">
                  Tarih : 
               </label>
               <div class="col-xl-9 col-lg-9">
                   <input style="width: 20%;" class="form-control m-input" type="date" name="created_at" 

                   
                  @if(request()->route()->action['as']=='news.edit')
                     value="{{$datas['created_at']->format('Y-m-d')}}"
                  @else
                     value="{{ date('Y-m-d') }}"
                   @endif

                    min="2018-01-01" >
                   <div class="clearfix"></div>
                  <span class="m-form__help">
                     İçerik bu alandan belirlediğiniz tarihe göre sıralanacaktır.
                  </span>
               </div>
            </div>
            {{
            Form::bsText(
            'video',
            'Video url',
            'Youtube Video kodu Ör. https://www.youtube.com/watch?v=Bl3KM79-fzo adresindeki v= den sonraki kod Bl3KM79-fzo',
            $datas['video']
            )
            }}


            <div class="form-group m-form__group row">
               <label class="col-form-label col-lg-3 col-sm-12">
                  Durumu :
               </label>
               <div class="col-lg-9 col-md-9 col-sm-12">
                  <input name="status" value="active" data-switch="true" type="checkbox" id="m_switch_1"
                  @if($datas['status']=='active' || $datas['status']=='') checked="checked" @endif
                  >
               </div>
            </div>
            <div class="clearfix"></div>
         </div>
         <div class="tab-pane" id="galeri" role="tabpanel">
            <div class="form-group m-form__group row">
               <div class="col-lg-12 col-md-12 col-sm-12">
                  <div class="m-dropzone dropzone m-dropzone--primary" id="m-dropzone-two">
                     
                     <div class="custom-file col-xl-9 col-lg-9">
                        <input name="img[]" multiple="" type="file" class="custom-file-input m-dropzone dropzone m-dropzone--primary" id="customFile">
                     </div>
                     <div class="clearfix"></div>
                     <div class="m-dropzone__msg dz-message needsclick">
                        <i class="la la-cloud-upload fontsize-40"></i>
                        <div class="clearfix"></div>
                        <h3 class="m-dropzone__msg-title">
                        Yüklemek istediğiniz resimleri buraya bırakın veya yüklemek için tıklayın.
                        </h3>
                        <span class="m-dropzone__msg-desc">
                           Boyutu en fazla 2mb olan 10 resim seçiniz, desteklenen resim formatları (jpg, png, gif, svg)dir.
                        </span>
                     </div>
                  </div>
               </div>
            </div>
            @if(request()->route()->action['as']=='news.edit')
            <ul class="editGal">
               @foreach($images as $image)
               <li>
                  <img src="{{ url('assets/images/uploads/news/'.$datas->id.'/thumbnails/'.$image->image) }}">
                  <div class="clearfix"></div>
                  <div class="delete">
                     <label class="m-checkbox">
                        <input name="deletePhoto[{{ $image->id }}]" type="checkbox">Sil
                        <span></span>
                     </label>
                  </div>
               </li>
               @endforeach
            </ul>
            <div class="clearfix"></div>
            @endif
         </div>
         <div class="tab-pane" id="seo" role="tabpanel">
            <div class="col-md-6 pull-left">
               {{
               Form::bsText(
               'slug',
               'Slug',
               'Bu alan benzersiz adresinizi ifade ediyor. Örn. siteniz.com/{slug}',
               $datas['slug'],
               $attribute = ['id' => 'meta-url']
               )
               }}
               {{
               Form::bsText(
               'meta_title',
               'Başlık',
               'Bu alan google aramalarda görünecek başlık kısmını ifade ediyor. (60 karakteri geçmemesi önerilir.)',
               $datas['meta_title'],
               $attribute = ['id' => 'meta-title']
               )
               }}
               {{
               Form::bsTextarea(
               'meta_description',
               'Açıklama',
               'Bu alan google aramalarda görünecek açıklama kısmını ifade ediyor. (320 karakteri geçmemesi önerilir.)',
               $datas['meta_description'],
               $attribute = ['id' => 'meta-desc']
               )
               }}
               {{
               Form::bsText(
               'meta_image',
               'Görsel',
               'Bu alan google aramalarda görünecek resim kısmını ifade ediyor. (600x315px ebatlarında bir görsel adresi girmelisiniz.)',
               $datas['meta_image'],
               $attribute = ['id' => 'meta-featured-image']
               )
               }}
            </div>
            <div class="col-md-6 pull-right">
               <h6>Google arama sonuçu görünümü</h6>
               <div id="seopreview-google"></div>
               <h6>Facebook paylaşım görünümü</h6>
               <div id="seopreview-facebook"></div>
            </div>
            <div class="clearfix"></div>
            
         </div>
         
      </div>
   </div>

   <div class="m-portlet__foot m-portlet__foot--fit">
      <div class="m-form__actions m-form__actions pull-right">
         <div class="row">
            <div class="col-lg-12 ml-lg-auto">
               <a href="{!! route('news.index') !!}" class="btn btn-secondary">Geri</a>

               {!! Form::submit('Kaydet', ['class'=>'btn btn-brand']) !!}
            </div>
         </div>
      </div>
   </div>
   <div class="clearfix"></div>
</div>
<div class="clearfix"></div>

{!! Form::close() !!}

<!--end::Form-->

edit.blade.php code screen.

@extends('backend.app')
@section('content')
    <div class="m-alert m-alert--icon m-alert--air m-alert--square alert alert-dismissible m--margin-bottom-30" role="alert">
        <div class="m-alert__icon">
            <i class="flaticon-exclamation m--font-brand"></i>
        </div>
        <div class="m-alert__text">
            Bu bölümden sitenizin haberlerini yönetebilirsiniz.
        </div>
    </div>
    <div class="m-portlet m-portlet--mobile">
        <div class="m-portlet__head">
            <div class="m-portlet__head-caption">
                <div class="m-portlet__head-title">
                    <h3 class="m-portlet__head-text">
                    Haberler
                    </h3>
                </div>
            </div>
        </div>
        @include('backend.news.form')
    </div>

@section('css')
    <link href="/backend/assets/custom/css/style.css" rel="stylesheet" type="text/css" />
    <link rel="stylesheet" type="text/css" href="/backend/assets/app/css/jquery-seopreview.css">
@endsection

@section('js')
    <script src="/backend/assets/demo/default/custom/header/actions.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/forms/widgets/bootstrap-switch.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/base/sweetalert2.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/forms/widgets/dropzone.js" type="text/javascript"></script>
    <script src="/backend/assets/app/js/jquery-seopreview.js"></script>
    <script type="text/javascript">
       $(document).ready(function() {
         $.seoPreview({
           google_div: "#seopreview-google",
           facebook_div: "#seopreview-facebook",
           metadata: {
             title: $('#meta-title'),
             desc: $('#meta-desc'),
             url: {
                use_slug: true,
                base_domain: '{{url('')}}/',
                full_url: $('#meta-url')
             }
           },
           google: {
               show: true,
               date: false
           },
           facebook: {
               show: true,
               featured_image: $('#meta-featured-image')
           }
         });
         $("select[selectedvalue]").each(function(){
            var self = $(this);
            self.val(self.attr("selectedvalue"));
        });
       });
     </script>

@if ($errors->any())
<script type="text/javascript">
    Swal({
      title: 'Hata!',
      text: '@foreach ($errors->all() as $error) {{ $error }} @endforeach',
      type: 'error',
      confirmButtonText: 'Tamam'
    })
</script>
@endif

@endsection

@endsection

create.blade.php code screen.

@extends('backend.app')
@section('content')
    <div class="m-alert m-alert--icon m-alert--air m-alert--square alert alert-dismissible m--margin-bottom-30" role="alert">
        <div class="m-alert__icon">
            <i class="flaticon-exclamation m--font-brand"></i>
        </div>
        <div class="m-alert__text">
            Bu bölümden sitenizin haberlerini yönetebilirsiniz.
        </div>
    </div>
    <div class="m-portlet m-portlet--mobile">
        <div class="m-portlet__head">
            <div class="m-portlet__head-caption">
                <div class="m-portlet__head-title">
                    <h3 class="m-portlet__head-text">
                    Haberler
                    </h3>
                </div>
            </div>
        </div>
        @include('backend.news.form')
    </div>
@section('css')
    <link href="/backend/assets/custom/css/style.css" rel="stylesheet" type="text/css" />
    <link rel="stylesheet" type="text/css" href="/backend/assets/app/css/jquery-seopreview.css">
@endsection


@section('js')
    <script src="/backend/assets/demo/default/custom/header/actions.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/forms/widgets/bootstrap-switch.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/base/sweetalert2.js" type="text/javascript"></script>
    <script src="/backend/assets/demo/default/custom/components/forms/widgets/dropzone.js" type="text/javascript"></script>
    <script src="/backend/assets/app/js/jquery-seopreview.js"></script>
    <script type="text/javascript">
       $(document).ready(function() {
        $( "#meta-title" ).click(function() {
          $( "#meta-title" ).val('');
        });
        $( "#meta-desc" ).click(function() {
          $( "#meta-desc" ).val('');
        });
        $( "#meta-featured-image" ).click(function() {
          $( "#meta-featured-image" ).val('');
        });
         $.seoPreview({
           google_div: "#seopreview-google",
           facebook_div: "#seopreview-facebook",
           metadata: {
             title: $('#meta-title'),
             desc: $('#meta-desc'),
             url: {
                use_slug: true,
                base_domain: '{{url('')}}/',
               full_url: $('#meta-url')
             }

           },
           google: {
               show: true,
               date: false
           },
           facebook: {
               show: true,
               featured_image: $('#meta-featured-image')
           }
         });
       });
     </script>
@if ($errors->any())
<script type="text/javascript">
    Swal({
      title: 'Hata!',
      text: '@foreach ($errors->all() as $error) {{ $error }} @endforeach',
      type: 'error',
      confirmButtonText: 'Tamam'
    })
</script>
@endif


@endsection

@endsection