java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.h3xstream.findsecbugs.crypto.BadHexadecimalConversionDetector.visitClassContext(BadHexadecimalConversionDetector.java:65)
at edu.umd.cs.findbugs.DetectorToDetector2Adapter.visitClass(DetectorToDetector2Adapter.java:74)
at edu.umd.cs.findbugs.FindBugs2.analyzeApplication(FindBugs2.java:1193)
at edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:279)
at edu.umd.cs.findbugs.FindBugs.runMain(FindBugs.java:391)
at edu.umd.cs.findbugs.FindBugs2.main(FindBugs2.java:1300)

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