org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: Error calling action method of component with id
form:importButton
    at org.sakaiproject.portal.charon.handlers.ToolHandler.doPost(ToolHandler.java:70)
caused by: org.sakaiproject.tool.api.ToolException: Error calling action method of component with id form:importButton
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1216)
caused by: javax.servlet.ServletException: Error calling action method of component with id form:importButton
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
caused by: javax.faces.FacesException: Error calling action method of component with id form:importButton
    at javax.faces.component.UICommand.broadcast(UICommand.java:109)
caused by: javax.faces.el.EvaluationException: Exception while invoking expression #{spreadsheetUploadBean.importDataAndSaveAll}
    at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61)
caused by: org.sakaiproject.service.gradebook.shared.ConflictingAssignmentNameException: You can not save multiple assignments in a gradebook with
the same name
    at org.sakaiproject.tool.gradebook.business.impl.GradebookManagerHibernateImpl$29.doInHibernate(GradebookManagerHibernateImpl.java:2725)
    at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:372)
    at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:338)
    at org.sakaiproject.tool.gradebook.business.impl.GradebookManagerHibernateImpl.createAssignment(GradebookManagerHibernateImpl.java:2754)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy104.createAssignment(null:-1)
at org.sakaiproject.tool.gradebook.ui.SpreadsheetUploadBean.importDataAndSaveAll(SpreadsheetUploadBean.java:928)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:132)
    at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61)
    at javax.faces.component.UICommand.broadcast(UICommand.java:109)
    at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:97)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:171)
    at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32)
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)
    at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:139)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:565)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.sakaiproject.tool.gradebook.ui.RoleFilter.doFilter(RoleFilter.java:145)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
    at org.sakaiproject.jsf.util.JsfTool.dispatch(JsfTool.java:221)
    at org.sakaiproject.jsf.util.JsfTool.doPost(JsfTool.java:256)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:364)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
    at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:486)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1216)
    at org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:188)
    at org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:93)
    at org.sakaiproject.portal.charon.handlers.ToolHandler.doPost(ToolHandler.java:70)
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1059)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:616)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:548)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
    at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
    at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
    at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
    at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:595)