Thread:Project:Support desk/ Compilation failed: group name must start with a non-digit at offset

My wiki at Eroticature.org has developed a problem on every page displaying various messages, mostly " Compilation failed: group name must start with a non-digit at offset" and some variations on that. Does anybody know why this has happened or how to fix it? I hadn't made any changes under the hood. Eroticatorium (talk)