[Libreoffice] Extension-Repository: Need help to solve a Python error

Hi all,

I'm working on an environment for the LibreOffice extension and template repository. 
I use for this purpose Plone and Plone Software Center. I customized the Plone 
Software Center with the help of a Plone developer so that it suit our needs. But 
there is the need to store the binary files (extensions / templates) not into the 
database but in the file system. Therefor I installed another product 
"collective.psc.blobstorage". But if I try to upload a downloadable file to the 
repository I get with this add-on an error message:

Traceback (innermost last):
  Module ZPublisher.Publish, line 127, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 47, in call_object
  Module Products.CMFPlone.FactoryTool, line 438, in __call__
  Module Products.CMFPlone.FactoryTool, line 202, in __getitem__
  Module Products.CMFPlone.FactoryTool, line 68, in _createObjectByType
  Module Products.CMFCore.TypesTool, line 554, in _constructInstance
  Module Products.PloneSoftwareCenter.content.downloadablefile, line 7, in addPSCFile
  Module Products.ATContentTypes.content.base, line 120, in initializeArchetype
  Module Products.Archetypes.BaseObject, line 436, in setDefaults
  Module Products.Archetypes.Schema, line 501, in setDefaults
  Module Products.Archetypes.utils, line 152, in mapply
  Module Products.PloneSoftwareCenter.content.downloadablefile, line 109, in 
setDownloadableFile
  Module Products.ATContentTypes.content.base, line 328, in _setATCTFileContent
  Module Products.Archetypes.Field, line 1066, in set
  Module Products.Archetypes.Field, line 738, in set
   - __traceback_info__: ('downloadableFile', <PSCFile at /LibreOffice-Extensions-
and-Templates/test-for-
blob/testproject/releases/1.0/portal_factory/PSCFile/pscfile.2011-07-04.6575989816>, 
<File at downloadableFile>, {'mimetype': 'application/octet-stream', 'field': <Field 
downloadableFile(file:rw)>, 'default': '', '_initializing_': True, 'filename': ''})
  Module Products.PloneSoftwareCenter.storage, line 20, in set
  Module collective.psc.blobstorage, line 84, in set
  Module collective.psc.blobstorage, line 45, in set
TypeError: __init__() takes exactly 2 arguments (1 given)

I don't know yet, how to solve this Python error. I hope someone with Python 
knowledge could help me at this point. The both files are listed here:
http://amantke.de/libreoffice/blobstorage

Regards,
Andreas
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