Re-installation failed due to different application signatures

[2012-06-19 13:48:13 - Icontacts] Re-installation failed due to different application signatures.
[2012-06-19 13:48:13 - Icontacts] You must perform a full uninstall of the application. WARNING: This will remove the application data!
[2012-06-19 13:48:13 - Icontacts] Please execute 'adb uninstall com.cleaderwin.contact' in a shell.
[2012-06-19 13:48:13 - Icontacts] Launch canceled!

本错误是因为你之前手机上装的签名和你现在装的签名不一样，

解决办法：我一般是用命令，adb uninstall com.cleaderwin.contact 删除之前安装的程序，也就是手机上之前装的。