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[Assertion failed] - this argument is required; it must not be null
java.lang.IllegalArgumentException: Content must not be null at org.springframework.util.Assert.notNull(Assert.java:112) at com.atlassian.confluence.pages.attachments.CachingAttachmentDao.getLatestAttachment(CachingAttachmentDao.java:67) at com.atlassian.confluence.pages.DefaultAttachmentManager.getAttachment(DefaultAttachmentManager.java:125) at com.atlassian.confluence.pages.DefaultAttachmentManager.getAttachment(DefaultAttachmentManager.java:91) at com.atlassian.confluence.pages.DelegatorAttachmentManager.getAttachment(DelegatorAttachmentManager.java:101) at com.atlassian.confluence.pages.CachingAttachmentManager.getAttachment(CachingAttachmentManager.java:158) at sun.reflect.GeneratedMethodAccessor668.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.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 com.sun.proxy.$Proxy132.getAttachment(Unknown Source) at com.atlassian.confluence.content.render.xhtml.editor.embed.EditorEmbeddedImageResourceUnmarshaller.unmarshal(EditorEmbeddedImageResourceUnmarshaller.java:94) at com.atlassian.confluence.content.render.xhtml.editor.embed.EditorEmbeddedImageResourceUnmarshaller.unmarshal(EditorEmbeddedImageResourceUnmarshaller.java:41) at com.atlassian.confluence.content.render.xhtml.UnmarshalMarshalFragmentTransformer.transform(UnmarshalMarshalFragmentTransformer.java:28) at com.atlassian.confluence.content.render.xhtml.transformers.DefaultFragmentTransformer.transformFragment(DefaultFragmentTransformer.java:141) at com.atlassian.confluence.content.render.xhtml.transformers.DefaultFragmentTransformer.transform(DefaultFragmentTransformer.java:123) at com.atlassian.confluence.content.render.xhtml.editor.EditorXhtmlTransformer.transform(EditorXhtmlTransformer.java:45) at com.atlassian.confluence.content.render.xhtml.TransformerChain.transform(TransformerChain.java:33) at com.atlassian.confluence.content.render.xhtml.TransformerChain.transform(TransformerChain.java:33) at com.atlassian.confluence.content.render.xhtml.PluggableTransformerChain.transform(PluggableTransformerChain.java:39) at com.atlassian.confluence.content.render.xhtml.editor.DefaultEditorConverter.convert(DefaultEditorConverter.java:37) at com.atlassian.confluence.content.render.xhtml.DefaultFormatConverter.convertToStorageFormat(DefaultFormatConverter.java:123) at com.atlassian.confluence.plugins.templates.actions.CreatePageTemplateAction.createPageTemplate(CreatePageTemplateAction.java:36) at com.atlassian.confluence.plugins.templates.actions.CreatePageTemplateAction.execute(CreatePageTemplateAction.java:20) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165) at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:58)