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java.lang.NullPointerException: 	at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:722)	at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:376)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	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:691)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:594)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505)	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.exportResource(AbstractRendererExporterImpl.java:208)	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.exportImages(AbstractRendererExporterImpl.java:151)	at com.atlassian.confluence.importexport.impl.PdfExporter.generateXslFo(PdfExporter.java:174)	at com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExporter.java:97)	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.exportSpace(AbstractRendererExporterImpl.java:127)	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.doExport(AbstractRendererExporterImpl.java:109)	at com.atlassian.confluence.importexport.impl.PdfExporter.doExport(PdfExporter.java:63)	at com.atlassian.confluence.importexport.DefaultImportExportManager.exportAs(DefaultImportExportManager.java:112)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)	at $Proxy48.exportAs(Unknown Source)	at com.atlassian.confluence.importexport.actions.ExportSpaceLongRunningTask$2.doInTransactionWithoutResult(ExportSpaceLongRunningTask.java:85)	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:114)	at com.atlassian.confluence.importexport.actions.ExportSpaceLongRunningTask.runInternal(ExportSpaceLongRunningTask.java:61)	at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:21)	at java.lang.Thread.run(Thread.java:595)