Zannot and Amaya problems

Hi,
we have installed Zannot and Amaya 8.1 browser for testing purpose, but
when we try to save an annotation we get "Failed to post the annotation
: Bad Request" and when trying to load annotations a "Failed to load the
annotation index: Internal server error" error occurs.
We set amaya to search for "http://localhost:8080/Zannot", where Zannot
is the name of the annotation server object. 
We also registered for the w3 test server and everything works fine with
it.
Can anyone help?
Thanks a lot 

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