android device not showing up on clicking run [closed]

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I have LG optimus Black.
I have the following settings:

1. USB debugging on.
2. Unknown applications checked.
3. Driver installed.
4. The app is deployed on Android 2.1 an the phone has Android 2.2. So no problems there I guess.

In fact, it was working fine till some time ago.
But its not showing up now. Any ideas why? Thank you.

Answer 1

Try reinstalling the driver. Worked for me.