Error from using Android libraries

The logcat states something in the line

<div style="background-color: white; border: 0px; margin: 0px 0px 7px; padding: 0px; vertical-align: baseline;">Jar Mismatch Found 2 versions of android-support-v4.jar in the dependency list</div>It means we have two jar files, one from the project and the other one from the included library.
Delete the one in the current project folder (/libs). As long as the library stays included, this should be fine.

credit : StackOveflow