Groups in the primary axis error?

[Tadder]

My scheduled refresh is failing and I'm not quite sure why.  The error I've gotten shows in the attached pic.  I've looked at somethe data was refreshing just fine yesterday but today it fails.  Any ideas? What am I missing here?

[Tadder · Accepted solution]

Turns out there was a duplicate coming through in one of my tables that wasn't specified in the error, so I had to hunt it down.  Something screwy happened yesterday and caused a duplicate record.  I got rid of that duplicate and poof, the errors are gone.