Getting this error whenever I try to edit something. Please help!
Hello @Stashbox,
Thanks for asking. 
Please refer following thread for possible solutions and let us know how it goes:
Thanks.
Hey friends,
I read through a lot of these. After posting this here’s what I did:
- I deactivated all my plugins except the ones I absolutely needed. (Woocommerce, Woocommerce Subscriptions, Payment stuff)
- I completely removed the theme, child theme, and cornerstone via FTP.
- I reinstalled the theme and child theme
THEN IT WORKED!
It had been awhile since I updated the theme because every time I did the page came out all fudged up. I see that it’s due to the child theme that was in there before.
Thanks for being so attentive and replying so fast!
You’re welcome!
We’re glad we were able to help you out.