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add some printlns to show what variable has a null value.

Time to do some debugging. Add some more println statements to show the values of variables as the code executes and as the values of variables change.


Did you find cause for the error and fix...

There is a variable with a null value on line 113. Look at line 113 in the your source and see what variable is null. Then backtrack in the code to see why that variable does not have a valid value....