Android Application Development error: Your project contains error (s), please fix them before running your application.

There is a red cross in the project, I don't know what is missing, but there is no error in the bag, runProgramThe error message is: Your project contains error (s), please fix them before running your application.

I tried clean; I also tried the delete project and re-imported it, but it was useless.

Find the solution by chance:

Linux: window -- preferences -- Android -- default debug keystore in build displays the address "/home/jinli /. android/debug. keystore, delete the debug under this path. keystore and ddms. cfg

Window XP: Enter: C: \ Documents ents and Settings \ Administrator \. Android (win7 in c: \ Users \ ly \. Android)
Delete: Debug. keystore and ddms. cfg

Then we can. Hope to help you!