How did this happen?
I edited my vassal module in my laptop. I was using a weird vassal version, 3.1.1-196-gd11f845db6f9 (for 3.3.1 VASL compatibility).
Then at home I went to my PC where I only have 3.3.1 installed. “No problem” I thought. “I’ll just edit buildfile and moduledata files and replace 3.3.1-yaddayadd with 3.3.1”.
Done. But after some more module editing, now I get that error message whenever I try to refresh counters, even if I go back to my laptop.
Not a big deal, I have backup copies and can easily redo all recent modifications to my module. But I think this issue came up recently, so in case it’s worth exploring here’s one way to get this error message.