thank you for your quick response.
GNU gdb 6.3.50-20050815 (Apple version gdb-1708) (Thu Nov 3 21:59:02 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin".Attaching to process 1855.
[Switching to process 1855 thread 0x1e303]
2012-05-05 10:30:10.042 File Viewer[1855:1c103] +[LoggingVCO handleIt:]: unrecognized selector sent to class 0x317e8
2012-05-05 10:30:10.046 File Viewer[1855:1c103] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[LoggingVCO handleIt:]: unrecognized selector sent to class 0x317e8'
*** First throw call stack:
(0x2d70052 0x34fed0a 0x2d71add 0x2cd6f00 0x2cd6ce2 0x1b77e 0x1b7bd 0x1b484 0x1b55f 0x2d71e72 0x18d19ef 0x2d4497f 0x2ca7b73 0x2ca7454 0x2ca6db4 0x2ca6ccb 0x3a14879 0x3a1493e 0xfb9a9b 0x2e1d 0x2d95)
terminate called throwing an exception[Switching to process 1855 thread 0x1c103]
sharedlibrary apply-load-rules all
Current language: auto; currently objective-c