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javascript - Angular JS Image and text toggle

Can anyone please help me to understand, why I'm getting error in the given code:

<!DOCTYPE html>
<html lang="en" ng-app="demo1">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
  <title>SAM Store</title>
  <link rel="icon" href="./Static/Final-JPEG.jpg">
</head>

<body>
  <div>
    <div>
      <img src="./Static/Logo.png" ng-hide="Logo" onerror="logoerror()">
      <h1 ng-show="Logo">SAM Store</h1>
    </div>
  </div>
</body>
<script>
  var app = angular.module('demo1', []);

  function logoerror() {
    app.controller('header', function($scope) {
      $scope.Logo = true;
    });
  }
</script>

</html>

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