> Can somebody help me with this exception? What can be wrong am
> desperate..... What to look for?

Typically, the real error is further down in the text that what you included. 
Common causes are:
* Having a wicket:id the the HTML with no corresponding component
* Adding a component without adding the wicket:id (inverse of the above)
* Having both a component and a wicket:id but the nesting is wrong

- Tor Iver

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