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The issue is likely due to one of the following reasons:

1. Typographical error: There may be a typographical error in the function name or parameter names.

2. Incorrect function library: The function may not be part of the library that is currently being used. Double-check the library being used and ensure that the function is in that library.

3. Permissions: The user may not have the necessary permissions to use the function. Check the script editor to make sure the user has been given editing permissions.

4. Broken script: The script containing the function may have errors. Review the script for any syntax errors or try rerunning the script.

5. Case sensitivity: The function name may be case sensitive. Double-check the case of the function name to ensure it matches the case in the script.