Terminal Emulator isnt working :/

Hi, i have ICS for HTC Desire (Bravo), Android 4.0.4 and my problem when i start Terminal Emulator, i type "su" and i get # (superuser permissions) and when i type "adb uninstall package" i get message from terminal "waiting for device" and i dont know what to do :(

I need to uninstal com.android.vending


Thx for help :)