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

To fix the problem, you need to generate a new debug certificate. For this to be done, the existing debug.keystore file should be deleted.

Once the old certificate is deleted, the Eclipse plugin should generate a new certificate when we try to build a debug package. It would be a good idea to clean and then build the package for certificate generation.

To delete your debug certificate:

Linux & MacOS:

delete the debug.keystore file from ~/.android/debug.keystore

Windows:

C:\Users\YourUserName\.android\debug.keystore