An error has occurred

Stack trace
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javax.servlet.ServletException: Unknown command 'schedule/images/Vessel_info.gif'
	at com.wwglobal.schvop.web.client.Controller.service(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:295)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:260)
	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:137)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:353)
	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
	at oracle.security.jps.ee.http.JpsAbsFilter$3.run(JpsAbsFilter.java:175)
	at java.security.AccessController.doPrivileged(Native Method)
	at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
	at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:650)
	at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:112)
	at oracle.security.jps.ee.http.JpsAbsFilter.doFilterInternal(JpsAbsFilter.java:293)
	at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:150)
	at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:94)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
	at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:248)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
	at oracle.jrf.servlet.ExtensibleGlobalFilter.doFilter(ExtensibleGlobalFilter.java:92)
	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3800)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3766)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:344)
	at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:197)
	at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203)
	at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71)
	at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2454)
	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2302)
	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2280)
	at weblogic.servlet.internal.ServletRequestImpl.runInternal(ServletRequestImpl.java:1739)
	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1699)
	at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:272)
	at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:352)
	at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:337)
	at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:57)
	at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
	at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:655)
	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:420)
	at weblogic.work.ExecuteThread.run(ExecuteThread.java:360)