As i have written in some other thread please setup your keyboard as a emulationstation input device and the message should not pop up anymore.
The “Can’t register ps3 controller. Buttons are to sensitive. ” issue should be resolved now. If you use the newest ps3 driver module sbuttons (sensitive buttons) option is disabled.
How to update:
1. Close emulationstation with two F4 key presses.
cd RetroPie-Setup sudo git pull sudo ./retropie_packages.sh ps3controller