Failed to run new Grails project after upgrade to Grails2.3

after upgrade to Grails 2.3, when you create a new default Grails project, then run-app, it will failed and get error: :

• Groovy: compiler mismatch Project level is: 2.1 Workspace level is 2.0
• No such property: descriptor for class: org.codehaus.groovy.grails.plugins.GrailsPluginInfo
• No such property: version for class: org.codehaus.groovy.grails.plugins.GrailsPluginInfo

How to solve it? here is it:

1. open Dashboard
2. install Groovy 2.1 Eclipse Extension
3. restart GGTS 
4. (might need clean your project after restart)
5. open eclipse's Run - Run configuarations, then click "Run" button