java.lang.NullPointerException
        at org.netbeans.modules.ruby.railsprojects.classpath.BootClassPathImplementation.getGemManager(BootClassPathImplementation.java:280)
        at org.netbeans.modules.ruby.railsprojects.classpath.BootClassPathImplementation.getResources(BootClassPathImplementation.java:136)
        at org.netbeans.api.gsfpath.classpath.ClassPath.entries(ClassPath.java:296)
        at org.netbeans.modules.gsfret.source.GlobalSourcePath.createResources(GlobalSourcePath.java:214)
        at org.netbeans.modules.gsfret.source.GlobalSourcePath.access$1200(GlobalSourcePath.java:87)
        at org.netbeans.modules.gsfret.source.GlobalSourcePath$SourcePathImplementation.getResources(GlobalSourcePath.java:473)
        at org.netbeans.api.gsfpath.classpath.ClassPath.entries(ClassPath.java:296)
        at org.netbeans.modules.gsfret.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:713)
        at org.netbeans.modules.gsfret.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:679)
        at org.netbeans.modules.gsfret.source.usages.ClassIndexManager.writeLock(ClassIndexManager.java:80)
        at org.netbeans.modules.gsfret.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:676)
        at org.netbeans.modules.gsfret.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:651)
        at org.netbeans.napi.gsfret.source.Source$CompilationJob.run(Source.java:1140)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)