hai i new in android my first android program helloword get the following error [2010-08-21 15:56:41 - HelloAndroid] Failed to upload HelloAndroid.apk on device 'emulator-5554' [2010-08-21 15:56:41 - HelloAndroid] java.io.IOException: device (emulator-5554) request rejected: device not found [2010-08-21 15:56:41 - HelloAndroid] Launch canceled! please give a solution