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java.lang.NullPointerException: 	at com.thortech.xl.ddm.repositories.api.impl.APIManager.populateInstanceObject(APIManager.java:152)	at com.thortech.xl.ddm.repositories.api.impl.APIManager.invokeApiRetrieveChildren(APIManager.java:277)	at com.thortech.xl.ddm.repositories.api.impl.APIRepository.createSchemaInstance(APIRepository.java:110)	at com.thortech.xl.ddm.repositories.api.impl.APIRepository.createChildrenSchemaInstance(APIRepository.java:508)	at com.thortech.xl.ddm.engine.data.datatypes.SchemaInstance.populateChildren(SchemaInstance.java:898)	at com.thortech.xl.ddm.engine.visitor.PopulateChildrenVisitor.visitStarted(PopulateChildrenVisitor.java:48)	at com.thortech.xl.ddm.engine.data.datatypes.SchemaInstance.traverse(SchemaInstance.java:241)	at com.thortech.xl.ddm.engine.SchemaInstanceFacade.populate(SchemaInstanceFacade.java:307)	at com.thortech.xl.ddm.engine.SchemaInstanceFacade.addXMLSchemaInstance(SchemaInstanceFacade.java:257)	at com.thortech.xl.ejb.beansimpl.tcImportOperationsBean.addLastPreviewedFilePrivate(tcImportOperationsBean.java:688)	at com.thortech.xl.ejb.beansimpl.tcImportOperationsBean.addLastPreviewedFile(tcImportOperationsBean.java:664)	at Thor.API.Operations.tcImportOperationsIntfEJB.addLastPreviewedFilex(Unknown Source)	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 com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)	at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:37)	at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:54)	at com.bea.core.repackaged.springframework.jee.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:50)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at com.bea.core.repackaged.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)	at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)	at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy354.addLastPreviewedFilex(Unknown Source)	at Thor.API.Operations.tcImportOperationsIntf_uawk3z_tcImportOperationsIntfRemoteImpl.__WL_invoke(Unknown Source)	at weblogic.ejb.container.internal.SessionRemoteMethodInvoker.invoke(SessionRemoteMethodInvoker.java:40)	at Thor.API.Operations.tcImportOperationsIntf_uawk3z_tcImportOperationsIntfRemoteImpl.addLastPreviewedFilex(Unknown Source)	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 weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(RemoteBusinessIntfProxy.java:85)	at $Proxy358.addLastPreviewedFilex(Unknown Source)	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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)	at $Proxy359.addLastPreviewedFilex(Unknown Source)	at Thor.API.Operations.tcImportOperationsIntfDelegate.addLastPreviewedFile(Unknown Source)	at com.thortech.xl.webclient.actions.ConnectorUpgradeAction.prepareSummaryPage(ConnectorUpgradeAction.java:6010)	at com.thortech.xl.webclient.actions.ConnectorUpgradeAction.goNext(ConnectorUpgradeAction.java:2690)	at sun.reflect.GeneratedMethodAccessor1302.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)	at com.thortech.xl.webclient.actions.tcLookupDispatchAction.execute(tcLookupDispatchAction.java:133)	at com.thortech.xl.webclient.actions.tcActionBase.execute(tcActionBase.java:894)	at com.thortech.xl.webclient.actions.tcAction.execute(tcAction.java:213)	at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)	at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)	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.PwdMgmtNavigationFilter.doFilter(PwdMgmtNavigationFilter.java:121)	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$1.run(JpsAbsFilter.java:111)	at java.security.AccessController.doPrivileged(Native Method)	at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)	at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)	at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)	at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)	at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)	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:2277)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)