streamon is not a function

This error message typically occurs when you try to call the .on() method on a variable that is not of the correct data type or does not have that method defined.

If you are working with streams in Node.js, make sure that you have created a valid stream object before calling the .on() method. For example, you might have a typo in your code that is causing you to reference an undefined variable or property.

Here are a few things you can try to resolve this error:

1. Double-check that you have imported the correct modules and dependencies for working with streams.
2. Verify that the variable you are calling .on() on is actually a stream object.
3. Check for any typos or errors in your code that could be causing this issue.
4. If all else fails, try restarting your server or application and see if that resolves the problem.