Eclipse fails compiling apk

Im new to android. I have been writing my first app, I testing it about 2 weeks now. Everything is went good, when today my apk doesnt want to be installed on my Phone. So the followings happen: I use eclipse. I export the app with the right way: Android Tools -> Export Signed Application -> bablabla I got a key and e开发者_如何学编程verything so..

The Emulator runs it perfectly, but when I try to install it on my phone, its icon not showing as an android application, its like 3 blank pages, so it shows as an "unknow" file format, and when i try to install, error message appears: "No applications can perform this action"

It seems like Eclipse didnt build my project as an .apk file.

Can somebody helps me? What changed? Before this I could ran my apks on my Phone. (Samsung Galaxy S, but I dont think its really matter, I guess it will be an Eclipse thingee)

Check out this documentation: debbuging android app on device

It looks rather like problem with manifest file, but I think You can run Your app by description from the link.