error when update / save product page

[Mediatama Store]

Hi,

 

I just start a new prestashop instalation dan set auto update on, At first 3 weeks there was nothing going wrong, but now I noticed, everytime I update / click on my product tab, like price, association, there are warning like below when I want to save.

And also, the bullet / mark of my previous choice of associations in missing.

Any idea why this happens ? and how to fix it ?  Thanks.

 

 

 

[NemoPS]

Enable error reporting (see my signature). Then, before accessing the page, open the debug console (f12 on chrome).

Inspect the network tab, XHR, see the red entries' response, it should be the error it's causing you trouble