java.lang.AssertionError
        at org.netbeans.modules.selenium.server.SeleniumProperties.getInstanceProperties(SeleniumProperties.java:78)
        at org.netbeans.modules.selenium.server.Installer.restored(Installer.java:56)
        at org.openide.modules.ModuleInstall.installed(ModuleInstall.java:95)
        at org.netbeans.core.startup.NbInstaller.loadCode(NbInstaller.java:445)
        at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:361)
        at org.netbeans.ModuleManager.enable(ModuleManager.java:917)
        at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:289)
        at org.netbeans.core.startup.ModuleList.access$2600(ModuleList.java:117)
        at org.netbeans.core.startup.ModuleList$Listener.stepEnable(ModuleList.java:1565)
        at org.netbeans.core.startup.ModuleList$Listener.access$1600(ModuleList.java:1195)
        at org.netbeans.core.startup.ModuleList$Listener$1.run(ModuleList.java:1425)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:122)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:539)
        at org.netbeans.core.startup.ModuleList$Listener.run(ModuleList.java:1401)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)