[Zope] Zserver starting error

[F. Troester]

Hello,

as a beginner of Zope I have a start problem of the Zserver.
I created a Zclass in the Product Folder. It worked very well.

Now I get the following error, when I start the ZServer: 
------------------------------------------------------------------------
------------
2003-01-07T20:36:32 ERROR(200) ZODB Couldn't load state for
'\x00\x00\x00\x00\x0
0\x00J\xda'
Traceback (innermost last):
  Module ZODB.Connection, line 533, in setstate
ImportError: No module named *2Uv8GXJCU4rgyrZw1NhebQ==
------
2003-01-07T20:36:32 ERROR(200) Zope A problem was found when checking
the global
 product registry.  This is probably due to a Product being uninstalled
or renam
ed.  The traceback follows.
Traceback (innermost last):
  Module OFS.Application, line 218, in checkGlobalRegistry
  Module ZODB.Connection, line 533, in setstate
ImportError: No module named *2Uv8GXJCU4rgyrZw1NhebQ==
------
2003-01-07T20:36:32 INFO(0) Zope Beginning attempt to rebuild the global
ZClass
registry.
------
2003-01-07T20:36:33 INFO(0) Zope The global ZClass registry has
successfully bee
n rebuilt.
------------------------------------------------------------------------
-------------
The code *2Uv8GXJCU4rgyrZw1NhebQ== belongs to my ZClass.
When I call an object of this ZClass in any DTML-method, I get an error
"Product is broken".

I don't know the reason of this error.
Can anybody tell me, how to fix this error?

Thank you very much
Fritz