java.lang.NullPointerException 
    at org.ametys.plugins.repository.AmetysObjectResolver.resolveById(AmetysObjectResolver.java:272) 
    at org.ametys.cms.tag.jcr.JCRTagsDAO.getTag(JCRTagsDAO.java:195) 
    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:483) 
    at org.ametys.core.ui.ExecuteClientCallsAction._executeMethod(ExecuteClientCallsAction.java:133) 
    at org.ametys.core.ui.ExecuteClientCallsAction.act(ExecuteClientCallsAction.java:120) 
    at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode