[Zope] Setting permissions on File-Objects

[Ingo Assenmacher]

Hello.

I am currently using Zope with the following configuration:

Zope Version 2.1.0 (latest www.zope.org tarball)
Linux 2.1.10
ZServer

I have created some folders and uploaded some files to this one. After that I
clicked on the file icon and after that I tried to change security parameters
for that file.
After submitting ANY change I get the following:


Zope has encountered an error while publishing this resource. 

        Error Type: AttributeError
        Error Value: tag
[snip]
Traceback (innermost last):
  File /opt/Zope-2.1.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 214,
in publish_module
  File /opt/Zope-2.1.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 179,
in publish
  File /opt/Zope-2.1.0-linux2-x86/lib/python/Zope/__init__.py, line 202, in
zpublisher_exception_hook
    (Object: test_file)
  File /opt/Zope-2.1.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 165,
in publish
  File /opt/Zope-2.1.0-linux2-x86/lib/python/ZPublisher/mapply.py, line 160, in
mapply
    (Object: manage_changePermissions)
  File /opt/Zope-2.1.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 102,
in call_object
    (Object: manage_changePermissions)
  File /opt/Zope-2.1.0-linux2-x86/lib/python/AccessControl/Role.py, line 247,
in manage_changePermissions
    (Object: test_file)
  File /opt/Zope-2.1.0-linux2-x86/lib/python/AccessControl/Permission.py, line
171, in setRoles
AttributeError: (see above)
[snip]

a) What does that mean?
b) Have I done something wrong?

I would like to point out that this error does even occur when I just push the
"change" button without changing anything!

Thanks for your help,

regards,

Ingo.

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