Null Pointer Exception when executing a Java software

Hi,

I am using a java software for my research. It was distributed as
class files. The software takes a text file and do some computation
then it outputs the results. For some text files, the software runs
normally. However, for 2 files, the software outputs
java.lang.NullPointerException. Both files are in the same format as
the others. I don't have the source code, so I can not see the
problem.

Does anyone knows what could be wrong with the code?

The software is a data mining tool called Keel: http://sci2s.ugr.es/keel/download.php

Many thanks,
David
.

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