Conflict with StoreCustomizer Pro

Hi, When I try to customise woocommerce email, the customise page and sidebar are not opening. I get the following error: A critical error has occurred on this site. Check your site administrator email inbox for instructions.
then when I deactivate the StoreCustomizer plugin, it all works.
Any thoughts?

• This topic was modified 4 years, 1 month ago by Hauzz.

The page I need help with: [log in to see the link]