Exception in com.haulmont.cuba.web.widgets.CubaButton: 
com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:157) ~[vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:115) ~[vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:431) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:396) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:260) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:82) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1578) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:425) [vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	at com.haulmont.cuba.web.sys.CubaApplicationServlet.serviceAppRequest(CubaApplicationServlet.java:329) [cuba-web-7.2.4.jar:7.2.4]
	at com.haulmont.cuba.web.sys.CubaApplicationServlet.service(CubaApplicationServlet.java:215) [cuba-web-7.2.4.jar:7.2.4]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [servlet-api.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [catalina.jar:9.0.27]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-websocket.jar:9.0.27]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.27]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108) [spring-web-5.2.3.RELEASE.jar:5.2.3.RELEASE]
	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74) [spring-web-5.2.3.RELEASE.jar:5.2.3.RELEASE]
	at com.haulmont.cuba.web.sys.CubaHttpFilter.doFilter(CubaHttpFilter.java:93) [cuba-web-7.2.4.jar:7.2.4]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.27]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [catalina.jar:9.0.27]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:9.0.27]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) [catalina.jar:9.0.27]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [catalina.jar:9.0.27]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [catalina.jar:9.0.27]
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) [catalina.jar:9.0.27]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [catalina.jar:9.0.27]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [catalina.jar:9.0.27]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-coyote.jar:9.0.27]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:9.0.27]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-coyote.jar:9.0.27]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) [tomcat-coyote.jar:9.0.27]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:9.0.27]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:9.0.27]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
Caused by: java.lang.reflect.InvocationTargetException: null
	at sun.reflect.GeneratedMethodAccessor283.invoke(Unknown Source) ~[na:na]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:153) ~[vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	... 38 common frames omitted
Caused by: java.lang.RuntimeException: Exception on action handling
	at com.haulmont.cuba.gui.xml.DeclarativeAction.actionPerform(DeclarativeAction.java:104) ~[cuba-gui-7.2.4.jar:7.2.4]
	at com.haulmont.cuba.web.gui.components.WebButton.buttonClicked(WebButton.java:67) ~[cuba-web-7.2.4.jar:7.2.4]
	at com.haulmont.cuba.web.widgets.CubaButton.fireClick(CubaButton.java:76) ~[cuba-web-widgets-7.2.4.jar:na]
	at com.vaadin.ui.Button$1.click(Button.java:57) ~[vaadin-server-8.9.2-6-cuba.jar:8.9.2-6-cuba]
	... 42 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
	at com.haulmont.cuba.gui.xml.DeclarativeAction.actionPerform(DeclarativeAction.java:101) ~[cuba-gui-7.2.4.jar:7.2.4]
	... 45 common frames omitted
Caused by: java.lang.RuntimeException: Tenants default parent group doesn't exist
	at com.haulmont.addon.sdbmt.web.tenant.TenantEdit.onCreateTenantRootGroup(TenantEdit.java:122) ~[sdbmt-web-2.0.2.jar:na]
	... 50 common frames omitted