Yep, I would say so. The typical error message that's shown is something like "DEFAULT CATCH! code: fffffff6 %RR0: ff80b260 %SRR1: 0000b030": the code indicates the type of error encountered, while the following part of the message is the hexadecimal representation of the content of a few PowerPC registers, if I recall correctly.

There's little documentation on Apple OF errors, actually!