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java.lang.NullPointerException: 	at com.thortech.xl.gc.util.ImageGenerator.createVertex(ImageGenerator.java:1770)	at com.thortech.xl.gc.util.ImageGenerator.setParentcells(ImageGenerator.java:868)	at com.thortech.xl.gc.util.ImageGenerator.generateImage(ImageGenerator.java:530)	at com.thortech.xl.webclient.util.UIFacade.getImage(UIFacade.java:2333)	at com.thortech.xl.webclient.actions.CreateConnectorAction.imageScreen(CreateConnectorAction.java:1251)	at com.thortech.xl.webclient.actions.CreateConnectorAction.goNext(CreateConnectorAction.java:522)	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:597)	at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)	at com.thortech.xl.webclient.actions.tcLookupDispatchAction.execute(tcLookupDispatchAction.java:133)	at com.thortech.xl.webclient.actions.tcActionBase.execute(tcActionBase.java:894)	at com.thortech.xl.webclient.actions.tcAction.execute(tcAction.java:213)	at com.thortech.xl.webclient.actions.CreateConnectorAction.execute(CreateConnectorAction.java:136)	at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)	at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at com.thortech.xl.webclient.security.XSSFilter.doFilter(XSSFilter.java:105)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at com.thortech.xl.webclient.security.CSRFFilter.doFilter(CSRFFilter.java:76)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.iam.platform.auth.web.OIMAuthContextFilter.doFilter(OIMAuthContextFilter.java:107)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119)	at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)	at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442)	at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103)	at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)	at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)