Answer by Jorgesys for "Debug certificate expired" error in Eclipse Android plugins

• WINDOWS

Delete: debug.keystorelocated inC:\Documents and Settings\\[user]\.android, Clean and build your project.

• Windows 7go to C:\Users\[username]\.android and delete debug.keystore file.

Clean and build your project.

• MAC

Delete your keystore located in ~/.android/debug.keystore Clean and build your project.

In all the options if you can´t get the new debug.keystore just restart eclipse.