[news.eclipse.webtools] jface error

["Axel Gallus" <uh5d@xxxxxxxxxxxxxxxxxxx>]

I downloaded the WTP 2.0 all in one package and eclipse 3.3
Then I downloaded the WTP source with the releng tools.
Then I programmed my own plugin , everyone worked fine
even if i got the following error message in my error log:

Problems occurred when invoking code from plug-in:
"org.eclipse.jface".

This wasn't an issue until now, but when i try to extend the eclipse 
preferences i have to use jface
and when clicking on my added preference page a jface error gets reported.

Someone has an idea how to solve this?

Greetings

A.Gallus