Difficulty with "inconsistent use of tabs and spaces in indentation" in file called <string>

[ibloom]

I've been trying for a couple days to build a program using pyObjC on
a mac, I'm stuck on this error:

<string>: inconsistent use of tabs and spaces in indentation
Traceback (most recent call last):
  File "setup.py", line 59, in ?
    setup(**setup_options)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/distutils/core.py", line 149, in setup
    dist.run_commands()
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/distutils/dist.py", line 946, in run_commands
    self.run_command(cmd)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/distutils/dist.py", line 966, in run_command
    cmd_obj.run()
  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/py2app/py2app/build_app.py", line 342, in run
    self.initialize_plist()
  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/py2app/py2app/build_app.py", line 415, in
initialize_plist
    plist = self.get_default_plist()
  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/py2app/py2app/build_app.py", line 294, in
get_default_plist
    version = find_version(target.script)
  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site-packages/py2app/py2app/util.py", line 13, in
find_version
    ast = compiler.parseFile(fn)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/compiler/transformer.py", line 48, in parseFile
    return parse(src)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/compiler/transformer.py", line 52, in parse
    return Transformer().parsesuite(buf)
  File "/Library/Frameworks/Python.framework/Versions/2.4//lib/
python2.4/compiler/transformer.py", line 129, in parsesuite
    return self.transform(parser.suite(text))
  File "<string>", line 628
    else:
    ^
SyntaxError: invalid syntax

I don't even know which file has the indentation problem.

Any thoughts.
Ian Bloom