[TxMt] on saving tooltip 'error' msg

[plastichairdoo]

hey there - just wondering if the tooltip error msg that appears sometimes when saving a file has any utility? in other words, is there somewhere I can find a log of what the error is?
it's a bit frustrating to be told there's an error but not what it is or where it is etc etc.

I'm sure the answer's obvious enough but I can't find any documentation that discusses it.

cheers,
b