Your colleague has added an external script that compliments the internal one.
The problem is that something’s off and there’s an error in the console.
Function isLoaded should remain where it is and should be called from the external script.

This task is part of the Full-Stack JavaScript Course
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index.html

<!DOCTYPE HTML>
<html>
  <head>
    <title>Script practice</title>
  </head>
  <body>
    <h2 style="text-align: center">
      Open console
    </h2>
    <script src="script.js">
      function isLoaded() {
        console.log('Script loaded');
      }
    </script>
  </body>
</html>

script.js

isLoaded();