Error trying to customize theme

Hi, I can access the customizer and make changes to the layout.... but when I hit the 'save' button I get an error (see image). I have checked the administrator settings and I have full permission of all settings. Any thoughts?...

Solved !! I didn't realize I needed to include the '?' as part of the path....

Ooops ! I added a keyword to change the admin folder path and now I can't get in I have installed a re-direct on my website that contains the store. So now, every time I type the path including the keyword to enter the admin section I get a n...

Thanks. I just noticed that capability in the Settings section....

Changing location of admin folder

I have been checking various carts and installing them via softaculus. All I've tried, except Arastta allows one to change the name of the 'admin' folder for extra security. What files need modified and where to rename the admin folder? Thanks...