anhdv1979,
Sorry that you are facing issue with MyEclipse.
Can you please answer some questions to help us investigate further :
1) Please share your MyEclipse installation details from MyEclipse menu > Installation summary > Installation details ?
2) Can you please mention exact steps in detail on how you integrated EXTJS with Scaffold Spring CRUD application ? Please mention the exact steps in detail on what exactly you are doing ?
3) Please share us the EXTJS and Spring version you are using ?
4) Please mention what error you are seeing when working with Scaffold Spring CRUD Application ? Please attach the .log file located at <Workspace dir>/.metadata/.log file.