Extjs 5 Uncaught TypeError: Cannot read property 'schema' of null

问题

I changed extjs 4.2.3 to 5.0.1 and i have this error.Any ideas?

Uncaught TypeError: Cannot read property 'schema' of null

Ext.define.extractDataext-all-debug.js:8144 Ext.Base.Base.addMembers.callParentext-all-debug.js:61852 Ext.define.extractDataext-all-debug.js:68174 Ext.define.onNodeInsertext-all-debug.js:68093 Ext.define.onNodeAppendext-all-debug.js:68329 Ext.define.updateRoot

来源：https://stackoverflow.com/questions/27169371/extjs-5-uncaught-typeerror-cannot-read-property-schema-of-null