I just upgraded my support library from compile \'com.android.support:appcompat-v7:23.1.1\'
from compile \'com.android.support:appcompat-v7:23.1.0\'
. <
Try to clean the solution and the Build it again. You might have problems with the versions of packages or dlls in your solution.
They changed the package slightly, removing the 'internal'. You just need to change your imports:
android.support.v7.internal.view.menu.MenuBuilder
to
android.support.v7.view.menu.MenuBuilder