java.lang.AssertionError
        at org.netbeans.modules.selenium.server.SeleniumProperties.getInstanceProperties(SeleniumProperties.java:77)
        at org.netbeans.modules.selenium.server.Installer.restored(Installer.java:56)
        at org.netbeans.core.startup.NbInstaller.loadCode(NbInstaller.java:440)
        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.trigger(ModuleList.java:225)
        at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:276)
        at org.netbeans.core.startup.Main.getModuleSystem(Main.java:168)
        at org.netbeans.core.startup.Main.start(Main.java:309)
        at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:111)
        at java.lang.Thread.run(Thread.java:619)