Nullpointer Error

Hey guys I'm using Java JDK v1.6.0 or dr Java(not really sure since I just downloaded it). I have a school assignment to do and I can't figure out what to do about this error.

1 error found:

File: (no associated file) [line: (no source location)]

Error: Compile exception: com.sun.tools.javac.util.ClientCodeException: java.lang.NullPointerException

I have already solved two previous errors and this one has been really frustrating me since I'm new to Java and I have alot of school assignments/projects to submit. I hope you guys can help me with this problem. I would greatly appreciate your help. Thanks.

[643 byte] By [JanDa] at [2007-11-26 22:21:19]