Eclipse NullPointerException I can't seem to fix

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http://stackoverflow.com – I am working on porting over a Java Maze application into Android. What this means is that I am taking the Java code given to me (I did not write this part), rewriting some of the classes (i.e. Changing the Java graphics into Android graphics so that it works on Android, and I have created the Android UI activities already. I'm also new to java and would classify myself at noob level for programming. My problem is this...from what I understand the maze is built with a 'buildthread'. I am attempting to intervene during the maze building process thread (buildthread) to update a progress bar on (HowTos)