I cant add items to my CMS

I am working on a new website and I created a CMS for blog posts. I have been trying to add items (my items or sample items) but I keep getting the same error - Invalid locale 6673fe4f6c03151f5e2c3ada

Please I need help urgently as this is delaying my work

Here is my public share link: LINK
(how to access public share link)

Here’s a read only link - Webflow - Meji Meji