[TheDemon]

If you rollback then force host no .2h files will have been provided, since llamaserver took them out to deal with the error. If you rollback I you'll need everyone to submit .2h files unless you want everyone to stale again.

No one knows the exact cause of this error, but it's common enough to be annoying and the only fix is to actually make the game re-save your .2h file. As in either "Redo turn from start" or go into your turn, change something, and hit end turn. Just hitting end turn might work, but better be safe.