I had an error in this range the other week.
I cannot locate it in Apple Error Codes98, and I hear it does exist and is not good.
What does this error mean? IIRC, it was -25556 or something in the -25K range with 5's and a 6. I did not pay attention to it and write it down exactly, and I should have.
I have also had an error code 11 just before the -25K. The error 11 was said to be hardware related, possibly.
But I don't know enough about the Mac -yet- to tell.