Problem with "svnadmin verify"

I have a problem verifying my repository although it's running fine
otherwise:

When verifying it I get the following errror:

...
* Verified revision 26.
* Verified revision 28.
* Verified revision 29.
* Verified revision 30.
svn: No such string 'lk'
------------------

Any help what's happening and how to fix it ?
I've already done a "svnadmin recover"

The repository is located on a Win2000 Server running
svnadmin, version 1.0.4 (r9844)
   compiled May 22 2004, 02:36:50

and was created by importing it via "svnadmin load ..." from a Linux server
running SuSE 9.1 running
svnadmin, version 1.0.3 (dev build)
   compiled May 19 2004, 09:56:03

regards,
Thomas

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