DynamicReport.SchemaRelationControl = function (relation) { var self =this ; var combotable=null; var createleftcombo=function (tblname){ var tables = Ext.create('Ext.data.Store', { fields: ['value', 'text'], data:[{text:tblname,value:tblname}] }); combotable = Ext.create('Ext.form.ComboBox', { fieldLabel: 'lefttable', store: tables, queryMode: 'local', displayField: 'text', valueField: 'value', renderTo:'fom-container', }); } var init=function () { createleftcombo(relation.tblname); } (); }; =================================== when i run this code it shows "type error u is null" please help me
var
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