Impossible to recover repository

Hello

I have a serious problem where I do not see where it came from. I tried
to make a checkout which did not finish. (Sorry, but I do not know
exactly the response, because now a checkout do not even start)
So the checkout seemed ok until it exited in the middle with a failure
like "Can't recode String" or something similar.

I tried then to verify the repository with svnadmin on the server with
the following result:

----
$ svnadmin verify /var/lib/subversion/anduin/repos/fh
svn: Berkeley DB error while opening environment for filesystem 
/var/lib/subversion/anduin/repos/fh/db:
DB_RUNRECOVERY: Fatal error, run database recovery
----
Trying to recover the database, I became a similar response:
----
$ svnadmin recover /var/lib/subversion/anduin/repos/fh
Please wait; recovering the repository may take some time...
svn: DB_RUNRECOVERY: Fatal error, run database recovery
----
I have no idea what went wrong. But I do know that the last commit endet 
successfully with no errorcode.
I hope someone here can help.
Best wishes
Michael
P.S. The Server runs with:
Debian -- Linux 2.4.26
Apache 2.0.52   (I access the repos over https)
Subversion 1.0.9 (r11378)
Berkeley v4.2 Database
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