React / NextJs Fast refresh is not working?

My pages folder like that ;

My code is here :
employees. Page code is below , when i click add Employee button ı redirect to add-employee but lets say when i change the code add-employee.js ı take this warning message what ı have to do ?
Page is refreshing why ?

 <div className='my-4 mx-6'>
       <Link href={'/employees/add-employee'}>
          <a className='flex items-center border p-3 '>
            <AiOutlineUserAdd />
            Add Employee
          </a>
        </Link> 
      </div>

Error Message