[ianlo]

Hi LFRobotics,
The key here is the java.lang.NullPointerException that the program prints out in your new code. What the NullPointerException means is that you're using a variable that hasn't been initialized yet or if you're trying to get something that doesn't exist. In this case, a button seems to be the issue. Looking back through the stack trace of the error, it seems to occur at edu.wpi.first.LFRobot2014.OI.<init>(OI.java:64). I would look through your OI file and check line 64. That is the line where it runs into an error. You'll notice that the NullPointerException segment of the output doesn't occur in your "Old code" as well so something that was changed on that line isn't quite working properly.

I can't speak directly to what the issue is since I've only used Joystick.getRawButton() rather than Button.whenPressed(), but I think it's likely that your Button hasn't been initialized properly.

Ian