(gdb) mono_backtrace 31 #0 0xb7de6196 in exit () from /lib/libc.so.6 #1 0x080c917e in mono_thread_exit () at threads.c:481 481 exit (mono_environment_exitcode_get ()); #2 0x0815f221 in mono_handle_exception_internal (ctx=0xbf9727dc, obj=0x822a0, original_ip=, test_only=0, out_filter_idx=0x0) at mini-exceptions.c:837 837 jit_tls->abort_func (obj); #3 0x0807d0d4 in throw_exception (eax=533152, ecx=2148734209, edx=533152, ebx=924400, esi=1931664, edi=1, ebp=3214354536, exc=0x822a0, eip=3045345936, esp=3214354492, rethrow=-1249621360) at exceptions-x86.c:393 393 mono_handle_exception (&ctx, exc, (gpointer)eip, FALSE); #4 0xb7ca072d in ?? () #5 0x000822a0 in ?? () #6 0x80131501 in ?? () #7 0x000822a0 in ?? () #8 0x000e1af0 in ?? () #9 0x001d7990 in ?? () #10 0x00000001 in ?? () #11 0xbf972868 in ?? () #12 0x000822a0 in ?? () #13 0xb5844a90 in System.Windows.Forms.ListBox:set_SelectedIndex (int) + 0x138 (0xb5844958 0xb5844ac1) [0x21ed8 - nunit.exe] ---Type to continue, or q to quit--- #14 0xbf97283c in ?? () #15 0xb5844a90 in System.Windows.Forms.ListBox:set_SelectedIndex (int) + 0x138 (0xb5844958 0xb5844ac1) [0x21ed8 - nunit.exe] #16 0x000822a0 in ?? () #17 0x004c1f48 in ?? () #18 0x000b5b90 in ?? () #19 0xbf97285c in ?? () #20 0x004c1f48 in ?? () #21 0x00000001 in ?? () #22 0x000822a0 in ?? () #23 0x00000001 in ?? () #24 0x000597d0 in ?? () #25 0x000717c8 in ?? () #26 0xbf9728cc in ?? () #27 0xb5844243 in NUnit.Gui.ProjectEditor:assemblyListBox_Populate () + 0x243 (0xb5844000 0xb584425d) [0x21ed8 - nunit.exe] #28 0x001d7990 in ?? () #29 0x00000001 in ?? () #30 0x0000000e in ?? ()