Uncaught SyntaxError: Unexpected token y in JSON at position 0? – Leads Tracker Chrome Extension

I’m trying to do a leads tracker chrome extension from a tutorial, and I’m following the code to a T. Here is my Code:

**HTML**
     <html>
      <head>
        <link rel="stylesheet" href="Practice.css" />
      </head>
      <body>
        <input type="text" id="input-el" />
        <button id="input-btn">SAVE INPUT</button>
        <button id="tab-btn">SAVE TAB</button>
        <button id="delete-btn">DELETE ALL</button>
        <ul id="ul-l"></ul>
        <script src="Practice.js"></script>
      </body>
    </html>


**javascript**
    let myLeads = [];
    let oldLeads = [];
    
    const inputEl = document.getElementById("input-el");
    const InputBtn = document.getElementById("input-btn");
    const ulEl = document.getElementById("ul-l");
    const DeleteBtn = document.getElementById("delete-btn");
    const TabBTN = document.getElementById("tab-btn");
    
    let LeadsFromLocalStorage = JSON.parse(localStorage.getItem("myLeads"));
    
    if (LeadsFromLocalStorage) {
      myLeads = LeadsFromLocalStorage;
      Render(myLeads);
    }
    
    function Render(Leads) {
      let ListItems = "";
      for (let i = 0; i < Leads.length; i++) {
        ListItems += `
        <li> 
          <a target = blank href = ${Leads[i]}>
            ${Leads[i]} 
          </a>
        </li>`;
      }
      ulEl.innerHTML = ListItems;
    }
    
    TabBTN.addEventListener("click", function () {
      chrome.tabs.query({ active: true, currentWindow: true }, function (tabs) {
        myLeads.push(tabs[0].url);
        localStorage.setItem("myLeads", JSON.stringify(myLeads));
        Render(myLeads);
      });
    });
    
    DeleteBtn.addEventListener("dblclick", function () {
      localStorage.clear("myLeads");
      myLeads.length = 0;
      Render(myLeads);
    });
    
    InputBtn.addEventListener("click", function () {
      myLeads.push(inputEl.value);
      inputEl.value = "";
      localStorage.setItem("myLeads", JSON.stringify(myLeads));
      Render(myLeads);
    });


**JSON**
    {
      "manifest_version": 3,
      "version": "1",
      "name": "Leads Tracker",
      "action": {
        "default_popup": "Practice.html",
        "default_icon": "AmongUs.png"
      },
      "permissions": ["tabs"]
    }

Every time I’m entering a link into the text box it won’t show up on the extension itself. If I open it in a tab by itself it will work just fine. Honestly don’t understand what is wrong.

More error info from chrome