Traceback (most recent call last):
  File "NARA_uploader_JPG.py", line 564, in <module>
    main(sys.argv[1:])
  File "NARA_uploader_JPG.py", line 505, in main
    filesToUpload = createDerivatives(sourcefilename)
  File "NARA_uploader_JPG.py", line 367, in createDerivatives
    makeDerivative('.jpg')
  File "NARA_uploader_JPG.py", line 356, in makeDerivative
    subprocess.call(cmd)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 444, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 595, in __init__
    errread, errwrite)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subprocess.py", line 1106, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory