An internal error occurred during: "Decoration Calculation". java.lang.NullPointerException

[marsxmu]

My environment : Eclipse3.6 + m2 Plugin + JBoss Tools3.2ml

Firstly,I imported the richfaces-showcase to my workspace using eclipse3.6,after resolving some troubles(I will talk about in another topic),I could clean or package the project.However, when I started  eclipse, waiting the auto building workspace finished,I clicked the component of richfaces-showcase, I got the error  window showing:'An internal error occurred during: "Decoration Calculation". java.lang.NullPointerException'.I thought this was bug of JBoss Tools.Now,I wonder if anybody else has been troubled by this question.

I will be very appreciate if anyone give me a suggestion.

Thanks.

[marsxmu]

It's due to jboss tools 3.2m1.I found  it works well after moving to jboss 3.2 beat1