When I try to run my Android project(which was working fine yesterday) I get the “Your project contains errors, please fix them before running your application” dialog. But my project has no errors. I’ve had this problem before, and the solution was always to Clean the project, but this time it isn’t helping. The red X icon disappears from the project in the workspace, then reappears when I try to run it. Also restarted Eclipse so it rebuilds the project. Help?
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Go to your .android folder and delete your debug certificate. In my computer it is in this path
Inside that there is a file name ‘debug.keystore’. Delete that,clean and try to build the project again. Sometimes this error is caused when the certificate expires.