[Q] Unable to write to sd card topic

I think I have seen this addressed somewhere before but I can not find it.

I have just updated to KitKat and am using Freeza's Stockish rom. When I try to run a restore in Mybackup, I am getting an error that says, Unable to write to sd card. Make sure the sd card is inserted properly, is not connected to your pc, and is not full.

When I go into Es file explorer, it shows all the files there.
How do I fix this?