Export to PDF stack trace

com.atlassian.confluence.importexport.ImportExportException:
org.apache.velocity.exception.MethodInvocationException: Invocation of
method 'exportWikiToXslFo' in class
com.atlassian.confluence.importexport.impl.WikiExporter threw exception
class com.atlassian.confluence.renderer.WikiRenderException :
org.dom4j.DocumentException: stream:40: ` ' is an unknown entity. XML
predefines only `<', `&', `>', `'' and `"'. All other entities must be
defined in an <!ENTITY> definition in the DTD. Nested exception: stream:40:
` ' is an unknown entity. XML predefines only `<', `&', `>', `'' and
`"'. All other entities must be defined in an <!ENTITY> definition in the
DTD. at
com.atlassian.confluence.importexport.impl.PdfExporter.generateXslFo(PdfExpo
rter.java:204) at
com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExp
orter.java:136) at
com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.expo
rtSpace(AbstractRendererExporterImpl.java:110) at
com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.doEx
port(AbstractRendererExporterImpl.java:92) at
com.atlassian.confluence.importexport.impl.PdfExporter.doExport(PdfExporter.
java:80) at
com.atlassian.confluence.importexport.DefaultImportExportManager.exportAs(De
faultImportExportManager.java:84) 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:324) at
org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflecti
on(AopProxyUtils.java:59) at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint
(ReflectiveMethodInvocation.java:201) at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Reflect
iveMethodInvocation.java:176) at
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(Tr
ansactionInterceptor.java:154) at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Reflect
iveMethodInvocation.java:196) at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopPro
xy.java:135) at $Proxy17.exportAs(Unknown Source) at
com.atlassian.confluence.importexport.actions.ExportSpaceAction.execute(Expo
rtSpaceAction.java:132) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:171) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(Defa
ultWorkflowInterceptor.java:58) at
com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(Conflu
enceWorkflowInterceptor.java:32) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.atlassian.confluence.core.ConfluenceValidationInterceptor.intercept(Conf
luenceValidationInterceptor.java:18) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.atlassian.confluence.security.actions.PermissionCheckInterceptor.interce
pt(PermissionCheckInterceptor.java:40) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterce
ptor.java:37) at
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocatio
n.java:168) at
com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:11
6) at
com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletD
ispatcher.java:182) at
com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatc
her.java:162) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:103) at
com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:9
6) at
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java
:129) at
com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(Profil
ingPageFilter.java:36) at
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:
61) at
com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)