[Q] Busybox won't install. topic

I can't get busybox installed. I get the following error:
"I am unable to verify whether or not certain utilities needed for this application to run are present and functional on your device.
This problem could be caused by a device that is not properly rooted or by superuser settings that are misconfigured. Please try the install again."

This is a Moto X 2014 US Pure Edition that was rooted with this guide: http://forum.xda-developers.com/moto...motox-t2889264

I can't create TWRP backups either with version 2.8.4.0. I get errno=13 Failed to make backup folder.

What can I do?

Thanks