In Android Version 2.1.2 , Adding Facebook SDK in build.gradle syncworks, but app launch failed.

In Android Version 2.1.2 , Adding Facebook SDK in build.gradle syncworks, but app launch failed.

Hi folks,

After adding this dependencie in build.gradle sync works, while launch application - In mainactivity.java used fragmentPagerAdapter subclass is declared but still its getting,

here its java.lang.ClassNotFoundException (i.e com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run) while debugging.

error exactly that this line:

mainActivityFragmentPageAdapter = new MainActivityFragmentPageAdapter(getSupportFragmentManager());

Thanks,
All