Thank you for your help!! I have found what causes the problem.

On 2 Sep., 21:07, Thomas Broyer <[email protected]> wrote:
> On Friday, September 2, 2011 7:59:31 PM UTC+2, Nik wrote:
>
> > Caused by: java.lang.RuntimeException: Server Error: null
>
> Your server-side code is causing a NullPointerException. Set a breakpoint
> into DefaultExceptionHandler to get the whole stack-trace.

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