eclipse安卓真机调试出现问题

用eclipse新建自动生成的HELLOWORLD的程序 无法导入手机
安装过程如下：
[2015-07-19 15:06:32 - helloworld] ------------------------------
[2015-07-19 15:06:32 - helloworld] Android Launch!
[2015-07-19 15:06:32 - helloworld] adb is running normally.
[2015-07-19 15:06:32 - helloworld] Performing com.example.helloworld.MainActivity activity launch
[2015-07-19 15:06:35 - helloworld] Uploading helloworld.apk onto device '4103bb2367bb3000'
[2015-07-19 15:06:35 - helloworld] Installing helloworld.apk...
[2015-07-19 15:06:38 - helloworld] Success!
[2015-07-19 15:06:38 - helloworld] Starting activity com.example.helloworld.MainActivity on device 4103bb2367bb3000
[2015-07-19 15:06:39 - helloworld] New package not yet registered with the system. Waiting 3 seconds before next attempt.
[2015-07-19 15:06:42 - helloworld] Starting activity com.example.helloworld.MainActivity on device 4103bb2367bb3000
[2015-07-19 15:06:42 - helloworld] New package not yet registered with the system. Waiting 3 seconds before next attempt.
[2015-07-19 15:06:45 - helloworld] Starting activity com.example.helloworld.MainActivity on device 4103bb2367bb3000
[2015-07-19 15:06:46 - helloworld] New package not yet registered with the system. Waiting 3 seconds before next attempt.
[2015-07-19 15:06:49 - helloworld] Starting activity com.example.helloworld.MainActivity on device 4103bb2367bb3000
[2015-07-19 15:06:49 - helloworld] New package not yet registered with the system. Waiting 3 seconds before next attempt.
`[2015-07-19 15:06:52 - helloworld] Starting activity com.example.helloworld.MainActivity on device 4103bb2367bb3000
[2015-07-19 15:06:53 - helloworld] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.helloworld/.MainActivity }
[2015-07-19 15:06:53 - helloworld] ActivityManager: Error type 3
[2015-07-19 15:06:53 - helloworld] ActivityManager: Error: Activity class {com.example.helloworld/com.example.helloworld.MainActivity} does not exist.`
有人知道为什么么 我一个朋友的手机可以安装