GWt output Windows

00:00:07.448 [ERROR] Could not deploy webapp.war
org.jboss.as.cli.CommandFormatException: {
    "outcome" => "failed",
         "failure-description" =>
         	{"JBAS014671: Failed services" =>
         		{"jboss.deployment.unit.\"webapp.war\".STRUCTURE" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"webapp.war\".STRUCTURE: Failed to process phase STRUCTURE of deployment \"webapp.war\""}},     "rolled-back" => true
          }
at org.jboss.as.cli.handlers.OperationRequestHandler.handle(OperationRequestHandler.java:79)
at org.jboss.as.cli.impl.CommandContextImpl.handle(CommandContextImpl.java:442)
at org.jboss.errai.cdi.server.as.JBossServletContainerAdaptor.<init>(JBossServletContainerAdaptor.java:125)
at org.jboss.errai.cdi.server.gwt.JBossLauncher.start(JBossLauncher.java:113)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1093)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836)

at com.google.gwt.dev.DevMode.main(DevMode.java:311)