Hi, I created screens for entity and got the next exception on open edit screen
java.lang.IllegalArgumentException: Ids must be unique, duplicate id: product
at com.vaadin.v7.ui.Table.setVisibleColumns(Table.java:694)
at com.haulmont.cuba.web.gui.components.WebAbstractTable.setVisibleColumns(WebAbstractTable.java:1883)
at com.haulmont.cuba.web.gui.components.WebAbstractTable.setItems(WebAbstractTable.java:1429)
at com.haulmont.cuba.gui.xml.layout.loaders.AbstractTableLoader.loadComponent(AbstractTableLoader.java:221)
at com.haulmont.cuba.gui.xml.layout.loaders.ContainerLoader.loadSubComponents(ContainerLoader.java:38)
at com.haulmont.cuba.gui.xml.layout.loaders.ContainerLoader.loadSubComponentsAndExpand(ContainerLoader.java:76)
at com.haulmont.cuba.gui.xml.layout.loaders.GroupBoxLayoutLoader.loadComponent(GroupBoxLayoutLoader.java:67)
at com.haulmont.cuba.gui.xml.layout.loaders.ContainerLoader.loadSubComponents(ContainerLoader.java:38)
at com.haulmont.cuba.gui.xml.layout.loaders.ContainerLoader.loadSubComponentsAndExpand(ContainerLoader.java:76)
at com.haulmont.cuba.gui.xml.layout.loaders.WindowLoader.loadComponent(WindowLoader.java:94)
at com.haulmont.cuba.web.sys.WebScreens.loadWindowFromXml(WebScreens.java:366)
at com.haulmont.cuba.web.sys.WebScreens.createScreen(WebScreens.java:233)
at com.haulmont.cuba.web.sys.WebScreens.create(WebScreens.java:175)
at com.haulmont.cuba.gui.builders.EditorBuilderProcessor.createScreen(EditorBuilderProcessor.java:338)
at com.haulmont.cuba.gui.builders.EditorBuilderProcessor.buildEditor(EditorBuilderProcessor.java:93)
at com.haulmont.cuba.gui.builders.EditorBuilder.build(EditorBuilder.java:359)
at com.haulmont.cuba.gui.actions.list.CreateAction.execute(CreateAction.java:329)
at com.haulmont.cuba.gui.actions.list.CreateAction.actionPerform(CreateAction.java:286)
at com.haulmont.cuba.web.gui.components.WebButton.buttonClicked(WebButton.java:67)
at com.haulmont.cuba.web.widgets.CubaButton.fireClick(CubaButton.java:76)
at com.vaadin.ui.Button$1.click(Button.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:153)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:115)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:431)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:396)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:260)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:82)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1578)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:425)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.serviceAppRequest(CubaApplicationServlet.java:329)
at com.haulmont.cuba.web.sys.CubaApplicationServlet.service(CubaApplicationServlet.java:215)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)
at com.haulmont.cuba.web.sys.CubaHttpFilter.doFilter(CubaHttpFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Could anyone help me to understand what about duplicates does it mean?