Invalid mapping on handler class

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When you encounter the error “invalid mapping on handler class”, it means that there is an issue with the mapping of your handler class in your HTML file. The mapping is responsible for connecting the handler class to the HTML file, allowing it to handle the requested actions.

To fix this error, you need to ensure that the mapping in your HTML file is correct and aligns with the handler class. Here is an example to illustrate the process:

<html>
  <head>
    <script src="handler.js"></script>
  </head>
  <body>
    <button onclick="handleClick()">Click me</button>

    <script>
      function handleClick() {
        // Do something
      }
    </script>
  </body>
</html>

In the above example, the HTML file includes a script tag to import a handler class from a separate file called “handler.js”. This handler class contains a function named “handleClick()”.

Now, let’s say you mistakenly update the HTML file, and instead of “handler.js”, you write “handler.php” in the script tag. This will result in an “invalid mapping on handler class” error because the HTML file cannot find the correct file to import the handler class from.

<html>
  ...
    <script src="handler.php"></script>
  ...

To resolve this error, make sure the mapping in the script tag matches the actual file name and its location.

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