Error 111 in Z8

I've been using Z8. I haven't edited the code at all, just added securities to the Assets list.

After working well for a couple of months, Z8 now returns Error 111: Crash in run at bar 553.

The only other clue I found was one asset with Error 058. I removed it from the list and Error 111 persists.

Please, can anyone here offer a solution?

Thanks!

If I trim my Assets list by 2/3, it eliminates the error. Is there a way to determine which asset was causing the problem? I have a long list, so trial and error will be really time consuming.