Problem in executing application

Hello i have created a sample application in android using eclipse IDE

my code was working perfect and i have seen output on emulator

suddenly in eclipse my project seems with red cross icon and when i am trying to run application at that time it is showing me following error

your project contains error(s), please fix them before running your application

i have seen my code lots of开发者_如何学Python time and not even single file is having any error message.

How to solve this problem??

Try cleaning your project (Project->clean) or try removing the auto-generated files inside the gen folder. I sometimes get errors with R.java that can only be resolved by removing it and letting eclipse recreating it.