Default [Q]Eclipse not running via ADB

I'm new at developing Apps. I'm following this guide:

I followed every step properly and created a dummy app. But in the end, the app doesn't run directly from eclipse.
There is no error shown. It says loading app and the dialog simply closes, with no result on the phone.

1.Taking the apk from the folder and manually installing works fine
2.Its working on Android Virtual Device also.

1. Phone is detected in ADB ('adb devices' shows my phone. It even shows in eclipse)
2. Phone is in Debugging mode

What could possibly be the problem?
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