Open class file shows multiple times java.lang.NullPointer exception

Hello,

Atelier 1.2 as well 1.3 throws java.lang.NullPointerException when opening a class file.

Never mind how to open the class file,  1) witin project explorer 2) atelier explorer 3) open resources  4) switcing between tabs (open files) etc..., I get these errors every time.

Never seen this problem in Atelier 1.1.

Do I miss something within the Eclipse environment? 

Does anyone has the same problem?

Best Regards,

Roger de Coninck.