When i create new project in android, i found each and every time error sign on project name just like picture, that could not run? So is that any solution to remove this error?


default.properties file seems like this, which is message from error log.
Have you tried going to Project->Clean… in the menu? This sometimes will help. Also try unchecking Project->Build Automatically and then right click on your project and run as Android.
Edit: You may also have to delete your debug.keystore file. This file should be located in your home directory. Then try clean and build from eclipse and the file should then get recreated.