"500 Internal Server Error" when i try to post in my blog module (tried with two different modules)

[WASD Models]

When I try to post in my blog module, "500 Internal Server Error" appears... i can read and edit comments in blog module, but when I try to edit o make a new post, the error appears.

I've tried with two different modules: "Leo Blog" and also "Smartblog" and the error appear in both cases when I try to post.

I'm using Prestashop 1.7. and this is my website: https://wasdmodels.com/

Thanks!

[Rhobur]

Enable the debug mode ans see what it says.