I have installed android sdk from google website and and android plugin from eclipse (add new software).
All my sdk and avd are working fine, but I was creating a new project, it shows me this message.
I am using mac, my java version is 1.7
I already tried all the solutions from stackoverflow and other websites mentioned related to this question.
I try to restart my eclipse several times and try to update sdk, but it doesn't help me in any way.

Try these steps 1. Close Eclipse, and go to the error occurring workspace folder delete the .metaData folder again open the eclipse with the same workspace 2. or create new workspace and import all the project to the new workspace.