I used to be able to run multiple workbenches at the same time and do quick comparisons between assets.
Now when I try to launch a 2nd or 3rd workbench, I get this error and it won't start.
I think there was a steam update recently, because it was working a few days ago.
related:
T168698
Project zomboid has a -nosteam launch option which makes modding and testing way faster.
I don't see why the enfusion tools need to be connected to steam at all, they don't use the steam workshop.
I fixed the error!
I verified the reforger tools in steam, after that it starts as expected (I can open multiple workbenches straight from the .exe (as long as steam is open in the background)).