Space PDF Export for non-administrators is not possible

Server Installed on Linux. Client working on Windows
100 licenses.

When normal users, who have export permission within a space try to export the space content (Space Tools/Content Tools/Export), on the page they see:
confluence pdf export "Required Security Token was not Present" Error

and in the log file:
2015-10-26 16:41:01,708 ERROR [Long running task: PDF Space Export] [xhtml.view.macro.ViewMacroMarshaller] marshalInternal Error rendering macro: content-report-table
– referer: https://vgconfluence.xxx.de/spaces/flyingpdf/flyingpdf.action?key=AMLBA | url: /spaces/flyingpdf/doflyingpdf.action | userName: ldxxx | action: doflyingpdf
com.google.template.soy.tofu.SoyTofuException: In template Confluence.Templates.User.userLinkUrl: When evaluating "contextPath()": Error while computing function "contextPath()": null
at com.google.template.soy.tofu.internal.BaseTofu.renderMainHelper(BaseTofu.java:341)
at com.google.template.soy.tofu.internal.BaseTofu.renderMain(BaseTofu.java:300)
at com.google.template.soy.tofu.internal.BaseTofu.access$100(BaseTofu.java:56)
at com.google.template.soy.tofu.internal.BaseTofu$RendererImpl.render(BaseTofu.java:427)
at com.atlassian.soy.impl.DefaultSoyManager.render(DefaultSoyManager.java:118)
at com.atlassian.soy.impl.DefaultSoyTemplateRenderer.render(DefaultSoyTemplateRenderer.java:52)
at sun.reflect.GeneratedMethodAccessor827.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy1066.render(Unknown Source)
at com.atlassian.confluence.plugins.soy.ConfluenceSoyTemplateRenderer.renderTo(ConfluenceSoyTemplateRenderer.java:57)
at com.atlassian.confluence.plugins.soy.ConfluenceSoyTemplateRenderer.renderTo(ConfluenceSoyTemplateRenderer.java:31)
at com.atlassian.confluence.renderer.template.DelegatingTemplateRenderer.renderTo(DelegatingTemplateRenderer.java:27)
at sun.reflect.GeneratedMethodAccessor647.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:134)
at com.sun.proxy.$Proxy412.renderTo(Unknown Source)
at sun.reflect.GeneratedMethodAccessor647.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
at com.sun.proxy.$Proxy412.renderTo(Unknown Source)
at com.atlassian.confluence.plugins.content_report.ContentReportTableMacro.renderTemplate(ContentReportTableMacro.java:196)
at com.atlassian.confluence.plugins.content_report.ContentReportTableMacro.execute(ContentReportTableMacro.java:148)
at com.atlassian.confluence.plugins.content_report.ContentReportTableMacro.execute(ContentReportTableMacro.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.atlassian.confluence.macro.xhtml.XhtmlMacroManager$ResourceAwareMacroInvocationHandler.invoke(XhtmlMacroManager.java:229)
at com.sun.proxy.$Proxy3071.execute(Unknown Source)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.executeMacro(ViewMacroMarshaller.java:208)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.marshalInternal(ViewMacroMarshaller.java:158)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.lambda$marshal$282(ViewMacroMarshaller.java:90)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller$$Lambda$162/179621850.marshal(Unknown Source)
at com.atlassian.confluence.impl.content.render.xhtml.analytics.MetricsCollectingMarshaller.marshal(MetricsCollectingMarshaller.java:56)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.marshal(ViewMacroMarshaller.java:96)
at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.marshal(ViewMacroMarshaller.java:44)
at com.atlassian.confluence.content.render.xhtml.UnmarshalMarshalFragmentTransformer.transform(UnmarshalMarshalFragmentTransformer.java:33)
at com.atlassian.confluence.content.render.xhtml.transformers.DefaultFragmentTransformer.transformFragment(DefaultFragmentTransformer.java:159)
at com.atlassian.confluence.content.render.xhtml.transformers.DefaultFragmentTransformer.transform(DefaultFragmentTransformer.java:135)
at com.atlassian.confluence.content.render.xhtml.storage.StorageXhtmlTransformer.transform(StorageXhtmlTransformer.java:45)
at com.atlassian.confluence.content.render.xhtml.TransformerChain.transform(TransformerChain.java:38)
at com.atlassian.confluence.content.render.xhtml.TransformerChain.transform(TransformerChain.java:38)
at com.atlassian.confluence.content.render.xhtml.PluggableTransformerChain.transform(PluggableTransformerChain.java:43)
at com.atlassian.confluence.content.render.xhtml.DefaultRenderer.render(DefaultRenderer.java:114)
at com.atlassian.confluence.content.render.xhtml.DefaultRenderer.render(DefaultRenderer.java:99)
at com.atlassian.confluence.content.render.xhtml.DeviceTypeAwareRenderer.render(DeviceTypeAwareRenderer.java:49)
at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderToHtml(RenderedXhtmlBuilder.java:426)
at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderToHtml(RenderedXhtmlBuilder.java:391)
at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderContentTreeNodes(RenderedXhtmlBuilder.java:366)
at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderContentTreeNodes(RenderedXhtmlBuilder.java:375)
at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.buildHtml(RenderedXhtmlBuilder.java:137)
at com.atlassian.confluence.extra.flyingpdf.FlyingSaucerPdfExporterService.createPdfForSpace(FlyingSaucerPdfExporterService.java:52)
at com.atlassian.confluence.extra.flyingpdf.PdfExportLongRunningTask$1.doInTransactionWithoutResult(PdfExportLongRunningTask.java:72)
at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
at com.atlassian.confluence.extra.flyingpdf.PdfExportLongRunningTask.runInternal(PdfExportLongRunningTask.java:52)
at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:27)
at com.atlassian.confluence.util.longrunning.ManagedTask.run(ManagedTask.java:58)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)