Probleme Store JsonReader

Bonjour ,

Code Store:

Code:

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//store pour editions
storeEdition=new Ext.data.Store({
                    autoLoad:true,
						proxy:new Ext.data.DWRProxy(Edition.getAll),
 
                	fields:['id_edition','libelle_edition','id_type_edit','nom_application',
					'nom_domaine','nom_program','nom_attribut','date_creation','num_version',
					'date_version','etat_edition'],
					 root:'editionc',
					reader:new Ext.data.JsonReader({	   
		            root:'editionc',id:'id'},[
                        {name: 'id_edition'},{name: 'libelle_edition'},{name:'id_type_edit'},{name:'nom_application'},
					{name:'nom_domaine'},{name:'nom_program'},{name:'nom_attribut'},{name:'date_creation'},{name:'num_version'},
					{name:'date_version'},{name:'etat_edition'}

et Erreur : JsonReader.read Json object not found