AppleScript Error -1728 - Can't get document 1

I'm trying to find out why my AppleScripts I use for Numbers automation are not working this month.

I have several scripts that I have built for processing expense reports and I ran them the last time in February without any problems. Whenever I run them now I get the following error message:

error "Numbers got an error: Can’t get document 1." number -1728 from document 1

I have looked at this post: https://discussions.apple.com/thread/7475864?answerId=29854515022#29854515022

I have not found the cache file listed in the ~/Library/Caches directory.... wondering where the heck Numbers might be sticking this file so I can delete it and see if this solves my problem.

Does anyone else have this problem or know where I might find the cache file for Numbers?

Thanks,

Rich