java.lang.IllegalArgumentException: file:/c:/ruby/lib/ruby/1.8 is not a valid classpath entry; it must end with a slash.
   at org.netbeans.modules.java.classpath.SimplePathResourceImplementation.verify(SimplePathResourceImplementation.java:97)
   at org.netbeans.modules.java.classpath.SimplePathResourceImplementation.verify(SimplePathResourceImplementation.java:65)
   at org.netbeans.modules.java.classpath.SimplePathResourceImplementation.<init>(SimplePathResourceImplementation.java:108)
   at org.netbeans.spi.java.classpath.support.ClassPathSupport.createResource(ClassPathSupport.java:78)
   at org.netbeans.modules.ruby.railsprojects.classpath.BootClassPathImplementation.getResources(BootClassPathImplementation.java:161)
   at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:311)
   at org.netbeans.modules.parsing.impl.indexing.PathRegistry.createResources(PathRegistry.java:592)
   at org.netbeans.modules.parsing.impl.indexing.PathRegistry.getSources(PathRegistry.java:230)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:2777)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:2015)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:3614)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:3554)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:587)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:0)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:0)
   at java.util.concurrent.FutureTask.run(FutureTask.java:0)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:0)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:0)
   at java.lang.Thread.run(Thread.java:0)