When I launch the emulator I face many problems (Errors):-
HttpConnectionApp]emulator-5554 disconnected! Cancelling \'net.paxcel.http.HttpConnectionApp activ
It's probably a bad install of ADT. Try uninstalling the plugin, restarting Eclipse, then installing it again fresh.
That of you aren't letting the emulator boot all the way up and are closing it before ADT/ADB can install/run your app.