Caused by: org.apache.excalibur.source.SourceException: Cannot get input stream for cocoon://_plugins/cms/hierarchical-reference-tables/tree.json?contentId=root&node=root&
	at org.apache.cocoon.components.source.impl.SitemapSource.getInputStream(SitemapSource.java:253)
	at org.ametys.core.ui.dispatcher.DispatchGenerator._dispatching(DispatchGenerator.java:151)
	... 67 more

Caused by: java.lang.IllegalArgumentException: org.apache.avalon.framework.component.ComponentException: ThreadSafeComponentManager attempted to retrieve component with null role.
	at org.ametys.runtime.plugin.component.AbstractThreadSafeComponentExtensionPoint.getExtension(AbstractThreadSafeComponentExtensionPoint.java:107)
	at org.ametys.cms.content.referencetable.GetHierarchicalReferenceTablesAction.act(GetHierarchicalReferenceTablesAction.java:87)
	at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:125)
	at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:47)