As the log cat says there are two different versions of support library. Please replace android-support-v4.jar library from your project with the android-support-v4.jar file from the library project that way you will have the same versions of compatible library file in your project and dependent library project(s). To do that, in the Package Explorer:
- go to libs folder of your library project --> right click on android-support-v4.jar --> select 'copy'
- go to your project --> right click on libs folder --> choose 'paste' --> click 'yes' to overwrite existing file.
- clean your project