when I run project this kind of error occurs

Question

LogCat shows this error,

[2011-05-05 08:57:54 - test] Failed to install test.apk on device 'emulator-5554': timeout
[2011-05-05 08:57:54 - test] Launch canceled!

Answer 1

How about changing adb connection timeout. it's default is 5000 ms.

    Window -> Preferences -> Android -> DDMS -> ADB connection timeout to 10000 ms

Answer 2

c:
cd\
cd C:\android\platform-tools
adb kill-server
adb start-server

copy the above in a notepad and save it as "ADB_restart.bat". Run it when you get this error. Will probably fix the error. This also fixes lot of connection problems with devices and emulators.

Also as suggested by HERO, Do increase your Timeout.

Answer 3

I have noticed that a combination of either restarting eclipse, or the phone/emulator, or both has proven effective in rectifying adb disconnects in many cases... I've never had luck with restarting adb after a disconnect personally