why this error occurs ""emulator-5554 disconnected! Cancelling 'com.helloG.CalculatorActivity activity launch'!" [duplicate]

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Why do I get a emulator-5554 disconnected message

this error appears sometimes and some开发者_StackOverflow中文版times my program run. "emulator-5554 disconnected! Cancelling 'com.helloG.CalculatorActivity activity launch'!" i do not understand why this happens,......:( please help me. my code is accurate by the way.

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you have to reset your adb. go to Eclipse IDE-->window--> Show Views --> device--> view menu --> reset adb

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Try this post, adb commands

navigate to android-sdk/tools/

and write 'adb reset' should work :D