Need help sudoers file

[shaggytwodope]

Indeed, the two lines that provide the error message. If you can share them we can fix it.

In general for security or other reasons, error messages like that one do not provide much details. This can not be debugged without more detailed info in alot of cases. The pkexec command uses a different means to access the stuff sudo can be used for. But it's not a replacement in the future.  So keep that in mind.