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

1. After Android is installed, when a new project is running, the "your project contains error (s), please fix them before running your application" dialog box appears ",

The following error message "manifest attribute 'minsdkversion' is set to '***'. integer is expected." appears? (For example)

Every time I see this, it's worse to die!

I tried almost all the methods and finally found a better solution!

The final result is that Debug. keystore has expired. Find it and delete it. It will be automatically regenerated,
This solves the problem.

How to find the Debug. keystore path: eclipse-> Windows-> preferences-> Android-> build-

> Default debug keystore:

Then you can !!! Clean the project first!