builder.py error when Building app

Hi,

I'm 99% finished with my app. I just added something very small, recompiled, and I get the following message when i'm trying to compile on the simulator:

[ERROR] Error: Traceback (most recent call last):
  File "..../Application Support/Titanium/mobilesdk/osx/1.8.1/iphone/builder.py", line 1286, in main
    execute_xcode("iphonesimulator%s" % link_version,["GCC_PREPROCESSOR_DEFINITIONS=__LOG__ID__=%s DEPLOYTYPE=development TI_DEVELOPMENT=1 DEBUG=1 TI_VERSION=%s %s %s" % (log_id,sdk_version,debugstr,kroll_coverage)],False)
  File ".../Application Support/Titanium/mobilesdk/osx/1.8.1/iphone/builder.py", line 1192, in execute_xcode
    output = run.run(args,False,False,o)
  File ".../Application Support/Titanium/mobilesdk/osx/1.8.1/iphone/run.py", line 39, in run
    sys.exit(rc)
SystemExit: 65

I tried to erase the "build" directory and recompile, but I still got the same result (builder.py error on line 1286 of main).

I'm not building a module, its an app. I don't think i've added anything strange. If it was the case, it would give me an error. There are no error warnings in my code.

I'm tired.

I would really be grateful if someone could kindly help and tell me where the problem is.

Thanking you in advance