Unchecked runtime.lastError while running tabs.executeScript: Cannot access contents of url

Question

I will be very grateful to you for your help! I looked through a lot of similar topics, but these answers did not help me. I create the expansion for google chrome, and I have to make a click on the icon open a new window with textarea, in this text area I have to write a message and send it to first user on list.

My manifest.json:

  {
  "name": "Linkedin Chrome Extension",
  "version": "1.0",
  "manifest_version": 2,
  "description": "This extension send message to Likedin users",
  "minimum_chrome_version": "26",
  "offline_enabled": true,

  "icons": {
    "16": "img/Spider-16.png",
    "48": "img/Spider-48.png",
    "128": "img/Spider-128.png" },

  "content_scripts": [
    {
      "js": [
        "js/jquery-3.2.0.min.js",
        "js/content.js"
      ],
      "matches": [
        "https://www.linkedin.com/*",
         "<all_urls>"
      ],
      "run_at":
      "document_idle",
      "all_frames": false
    }
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "js/background.js"
    ]
  },
  "web_accessible_resources": ["js/main.js", "index.html"],
  "permissions": [
    "storage",
    "<all_urls>",
    "tabs",
    "activeTab",
    "https://www.linkedin.com/*",
    "*://*/*",
    "notifications"
  ],

  "browser_action": { // broser elements
    "default_title": "Linkedin Extension"
  },
  "externally_connectable": {
    "matches": ["https://www.linkedin.com/*"]
  }
}

background.js

chrome.browserAction.onClicked.addListener(function (tab) {

    // if (tab.url.indexOf('https://www.linkedin.com') == -1) {
    //     alert('Please go to Linkedin.com, and run this extensions');
    // }else{
    chrome.tabs.create({
        url: chrome.runtime.getURL('index.html'),
        active: false
    }, function (tab) {
        chrome.windows.create({
            tabId: tab.id,
            type: 'popup',
            focused: true,
            width: 625,
            height: 400,
            top: 50
        });
    });
    chrome.tabs.executeScript(null, {file: "js/jquery.js"});
    chrome.tabs.executeScript(null, {file: "js/content.js"});
    // chrome.tabs.executeScript(null, {file: "js/main.js"});


});





chrome.runtime.onMessage.addListener(function (message_from_content, sender, sendResponse) {
    if (message_from_content == 'start'){

        chrome.tabs.executeScript(null, {file: "js/main.js"});
       console.log(message_from_content);
    }
});

content.js

document.getElementById('btnStart').onclick = function () {

     var text = document.getElementById('text').value;
    // var message = text.replace( '{name}', 'nick');

   setTimeout(function () {
        chrome.storage.local.set({
            'msg': text
        });
   }, 1000);
};

document.addEventListener('click', function () {
    chrome.runtime.sendMessage('start', function (response) {

    });
}, false);

main.js

setTimeout(function () {
    getData();
}, 1000);

function getData(){
    chrome.storage.local.get(['msg'], function (result) {
        var text_of_message = result.msg;
        //alert(m);
        handler(text_of_message);
    });
}


var list = $("#results-list").find('.result');

function  handler(message) {

    $.each(list, function (key, value) {
        if (key == 0){

            var users_name = $(value).find('.name').find('a').text(); // get name of users

            var new_message = message.replace( '{name}', users_name);

            $(value).find('.action-trigger').find('li').click(); //get button for open dropdown
            $(value).find('.send-message').click(); //click button for send message

            $("#subject").val("we are the best IT company in the world");
            $("#message-body-content").val(new_message);

        }
    });
}

I try get some message if button "btnStart" click, and open file main.js, but I get error in console:

Unchecked runtime.lastError while running tabs.executeScript: Cannot access contents of url "chrome-extension://mkeifaecfbamfcillngajldbnaedpepg/index.html". Extension manifest must request permission to access this host.
    at chrome-extension://mkeifaecfbamfcillngajldbnaedpepg/js/background.js:33:21 

If you now the solution of this problem plese help, and sorry for my English.