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java.lang.NullPointerException: 	at edu.umd.cs.findbugs.DetectorFactoryCollection.loadPlugins(DetectorFactoryCollection.java:250)	at edu.umd.cs.findbugs.DetectorFactoryCollection.ensureLoaded(DetectorFactoryCollection.java:214)	at edu.umd.cs.findbugs.DetectorFactoryCollection.instance(DetectorFactoryCollection.java:99)	at edu.umd.cs.findbugs.config.ProjectFilterSettings.(ProjectFilterSettings.java:93)	at edu.umd.cs.findbugs.config.ProjectFilterSettings.createDefault(ProjectFilterSettings.java:110)	at edu.umd.cs.findbugs.config.UserPreferences.(UserPreferences.java:75)	at edu.umd.cs.findbugs.config.UserPreferences.(UserPreferences.java:72)	at edu.umd.cs.findbugs.TextUICommandLine.(TextUICommandLine.java:78)	at edu.umd.cs.findbugs.FindBugs2.main(FindBugs2.java:681)