Public bug report changed:
https://launchpad.net/malone/bugs/29532

Comment:
I had exactly the same problem when i tried to add wav-files. After
removing python-gst-0.8.3-1 and keeping python-gst0.10 serpentine at
least began to load the wav-files until it crashed.

Here's the output with python-gst-0.8.3.1 installed:

----------snip--------------
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/serpentine/operations.py", line 290, 
in __start_next
    oper.start()
  File "/usr/lib/python2.4/site-packages/serpentine/mastering.py", line 179, in 
start
    l.on_finished (e)
  File "/usr/lib/python2.4/site-packages/serpentine/operations.py", line 318, 
in on_finished
    self.__start_next()
  File "/usr/lib/python2.4/site-packages/serpentine/operations.py", line 290, 
in __start_next
    oper.start()
  File "/usr/lib/python2.4/site-packages/serpentine/mastering.py", line 106, in 
start
    oper = audio.gvfsAudioMetadata(self.hints["location"])
  File "/usr/lib/python2.4/site-packages/serpentine/audio.py", line 350, in 
gvfsAudioMetadata
    filesrc.set_property ("location", uri)
AttributeError: 'NoneType' object has no attribute 'set_property'
--------snap-------------

On the second attempt (with --debug option) and third attempt (normal
run without --debug option) adding of the wav-files worked.

Perhaps the crash on the first attempt without python-gst-0.8.3-1 was a
result of an old python-gst instance still in the cache.

Nevertheless, serpentine either needs a version-checking for python-gst
or should conflict with < python-gst-0.10

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