Cookie Notice breaking Polylang?

Hi Chouby

After I installed Cookie Notice plugin, my Polylang refuses to save any change and shows a 404 page instead, even after deleting the cookie plugin.

I have other sites using both plugins, and they work beautifully. I tried changing the theme, but the problem remains.
I searched the forums and the net but I did not find mention of this issue: I cannot understand where the problem could be.

I have other sites thad need to be implemented with the cookie law norice, and they all use Polylang.
Could you help me?

Thank you!

https://www.ads-software.com/plugins/polylang/