Error in source code

What causes this issue?

Error in user edited source code.

System Response

Function "Pretty Printer" cannot be used on source code containing
errors.

How to fix this error?

Check your source code, clean up the errors, and restart the function.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.