Explanations:

Type 10 errors occur when, basically, a MacOS's table of instructionsdoesn't match the instructions it is receiving

Type 11 errors occur mainly on Power Macintosh computers, dependingon various factors. It is the result of programming errors. It representsany error (such as a bus error) in native code; it occurs on a Power Macintoshcomputer when a program crashes.
A Type 11 error is listed as a hardware exception error. However, Aswith all Macintosh Type xx errors, they usually do not identify a particularsoftware or hardware component error. Type xx errors are more general innature. You may see more Type 11 errors on a Power Macintosh computer becauseof problems with the software-based 68k emulator. The emulator allows theRISC processor to run older Macintosh software. If the emulator gets corruptedwhile loading into RAM, then some of the failures caused by this are reportedas Type 11 or Hardware Exception errors. The emulator can get corruptedby either incompatible software or faulty hardware.
 

Type 10 & 11 Software Fixes:

Step 1: Trash the Finder prefs, theFind File prefs, and (in 8.5x) the Find Preference

Step 2: Check RAM

Step 3: Disable Virtual Memory (ifit was found to be on from step two)

Step 4: Allocate more memory to the programin which the error occurs

Step 5: Depending on System version: Trashthe PPP Preferences, or Remote Access prefs folder (if it happens uponconnect)

Step 6: Rebuild the Desktop

Step 7: Zap the PRAM

Step 8: Do the Extension Shuffle

Step 9: It may be a software problem (with the program that seemsto be causing this)...contact the software vendor

Step 10 (when all else fails): Don't suggest this, just let themknow that doing this MAY fix the problem:  Format the hard drive andperform a clean installation of the system software.  If the problemscontinue, particularly in the Finder, it's probably a hardware issue.