java.lang.IllegalArgumentException: Already a C:\Users\Thilo-W7\Documents\NetBeansProjects\digialarmapp\nbproject\project.xml@a1f23c81:24334cee
   at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:127)
   at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:122)
   at org.openide.util.Mutex.writeAccess(Mutex.java:438)
   at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject0(ProjectGenerator.java:122)
   at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject(ProjectGenerator.java:103)
   at org.netbeans.modules.web.clientproject.util.ClientSideProjectUtilities.setupProject(ClientSideProjectUtilities.java:126)
   at org.netbeans.modules.web.clientproject.ui.wizard.ClientSideProjectWizardIterator.instantiate(ClientSideProjectWizardIterator.java:146)
   at org.openide.loaders.TemplateWizard$InstantiatingIteratorBridge.instantiate(TemplateWizard.java:1044)
   at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:605)
   at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:439)
   at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:253)
   at org.openide.loaders.TemplateWizardIteratorWrapper$ProgressInstantiatingIterator.instantiate(TemplateWizardIteratorWrapper.java:180)
   at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1597)
   at org.openide.WizardDescriptor.callInstantiate(WizardDescriptor.java:1541)
   at org.openide.WizardDescriptor.access$2200(WizardDescriptor.java:90)
   at org.openide.WizardDescriptor$Listener$2$1.run(WizardDescriptor.java:2181)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2044)