GeoPak: Station and Offset Not Working

I am trying to run the Station and Offset command in geopak and when I go to select my gpk file, I keep getting this error,

Has anyone every come across this at all? My payitem and utility command worked fine just before this and I can select the GPK file in the plan view labeler, so I know the GPK file is not corrupt. Any help is greatly appreciated!

Thank you

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