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java.lang.IllegalArgumentException: path must start with '/'	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)	at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:247)	at grails.plugins.vaadin.navigator.DefaultUriMappings.ensurePathOnly(DefaultUriMappings.groovy:89)	at grails.plugins.vaadin.navigator.DefaultUriMappings.findAllMatchingPathMappings(DefaultUriMappings.groovy:139)	at grails.plugins.vaadin.navigator.DefaultUriMappings.lookupPathMapping(DefaultUriMappings.groovy:155)	at grails.plugins.vaadin.navigator.DefaultUriMappings.findAllMatchingFragmentMappings(DefaultUriMappings.groovy:174)	at grails.plugins.vaadin.navigator.DefaultUriMappings.lookupFragmentMapping(DefaultUriMappings.groovy:193)	at grails.plugins.vaadin.navigator.DefaultUriMappings.containsFragmentMapping(DefaultUriMappings.groovy:281)	at org.vaadin.grails.navigator.UriMappings$containsFragmentMapping$3.call(Unknown Source)	at grails.plugins.vaadin.navigator.GrailsAwareViewProvider.getViewName(GrailsAwareViewProvider.groovy:23)	at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:504)	at com.vaadin.navigator.Navigator$navigateTo$0.call(Unknown Source)	at vdo.safir.AssfamAppUI$_createNavigationButton_closure1.doCall(AssfamAppUI.groovy:42)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)	at groovy.lang.Closure.call(Closure.java:414)	at org.codehaus.groovy.runtime.ConvertedClosure.invokeCustom(ConvertedClosure.java:54)	at org.codehaus.groovy.runtime.ConversionHandler.invoke(ConversionHandler.java:124)	at com.sun.proxy.$Proxy83.buttonClick(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198)	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)	at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:995)	at com.vaadin.ui.Button.fireClick(Button.java:393)	at com.vaadin.ui.Button$1.click(Button.java:61)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:158)	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118)	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:313)	at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:202)	at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:95)	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408)	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:281)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:115)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:75)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:499)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)	at java.lang.Thread.run(Thread.java:745)