Portal Runtime error

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Hi guys,

I played last week a little bit in our test system with portal. I created some iviews, pages and so on. Everything worked fine, but after that I got the following error message:

Exception ID:08:57_26/02/09_0114_108079250

Full Message Text

application [webdynpro/dispatcher] Cannot send an HTTP error response [500 Application error occurred during request processing. (details: java.lang.NullPointerException: null)].

The error is: com.sap.engine.services.servlets_jsp.server.exceptions.WebIOException: An attempt to write after the stream had been closed.

Exception id: [00096B6ED0DC005D00000D04000FE040000463CDA3BA805F]

I think I changed some permissions, but I am not sure were. So now I can not log in to my BI web applications and web queries.

thanks in advance for any help

Regards

Erwin