Error Java.lang.NullPointerException in JBuilder2006

[Jack]

I'm working with JBuilder2006 and I have been implementing a new class, and when I want to change to the design view, this message appears:
java.lang.NullPointerException

but it allows me to execute and compile without problems
I only can't change the view
I'll appreciate if you can help me

[Ed]

It usually happen when you write something like this

name.get();
and the name is null

[Peter]

Check the objects
surely there is an object that contains null
you have to initialize every object