Unable to start the Android Virtual AVD device

I have successfully installed the Android SDK and also linked the SDK Manager to the SDK path. Then I have created the AVD of API 8 and it's done. But while I am going to start the Virtual Device it's not sta开发者_开发知识库rted and gives me error like "@foo" can not started, commend line error, and also give me hint: open @foo for virtual device.

What exactly is 'foo'?

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