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Did you load LJUDJava.dll in your Java code?  Usually that error arises when the dll is not loaded or cannot be found.  The examples show how to do this with the System.loadLibrary call.  Also, take a look at this forum topic as it helps with issues like this: http://forums.labjack.com/index.php?showtopic=4899.

If this does not help to resolve your problem, a better place to continue this issue would be in the Java section of our forum or by support email.