java.lang.NullPointerException
Caused: java.lang.RuntimeException: Error during incremental deploy: java.lang.NullPointerException
   at org.netbeans.modules.j2ee.deployment.impl.ServerFileDistributor._distributeOnSave(ServerFileDistributor.java:440)
   at org.netbeans.modules.j2ee.deployment.impl.ServerFileDistributor.distributeOnSave(ServerFileDistributor.java:224)
   at org.netbeans.modules.j2ee.deployment.impl.TargetServer.distributeChangesOnSave(TargetServer.java:255)
   at org.netbeans.modules.j2ee.deployment.impl.TargetServer.notifyArtifactsUpdated(TargetServer.java:877)
   at org.netbeans.modules.j2ee.deployment.impl.DeployOnSaveManager$DeployTask.notifyServer(DeployOnSaveManager.java:497)
   at org.netbeans.modules.j2ee.deployment.impl.DeployOnSaveManager$DeployTask.run(DeployOnSaveManager.java:414)
   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$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:680)