PDF Export Failes with NoSuchMethodError

Exception in thread "Export Space task" java.lang.NoSuchMethodError: org.w3c.tidy.Tidy.setInputEncoding(Ljava/lang/String;)V
	at com.atlassian.confluence.importexport.impl.WikiExporter.<init>(WikiExporter.java:63)
	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.createTemplateSupport(AbstractRendererExporterImpl.java:203)
	at com.atlassian.confluence.importexport.impl.PdfExporter.prepareExportTemplate(PdfExporter.java:75)
	at com.atlassian.confluence.importexport.impl.PdfExporter.generateXslFo(PdfExporter.java:173)
	at com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExporter.java:97)
	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.exportSpace(AbstractRendererExporterImpl.java:106)
	at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.doExport(AbstractRendererExporterImpl.java:89)
	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 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:304)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy60.exportAs(Unknown Source)
	at com.atlassian.confluence.importexport.actions.ExportSpaceLongRunningTask$1.doInTransactionWithoutResult(ExportSpaceLongRunningTask.java:87)
	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
	at com.atlassian.confluence.importexport.actions.ExportSpaceLongRunningTask.runInternal(ExportSpaceLongRunningTask.java:58)
	at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:21)
	at java.lang.Thread.run(Thread.java:619)