jQuery ajax error submitting a new user registration

[DrShow]

Hello,
I’ve found alot of solutions about this problem but on my site, still be buggy. Everytime I try to submit my registration, a pop-up message appear on top of screen ( http://prntscr.com/6ah04b ), but the User is registred from the console!
There’s also a problem when i’m tryng to login with my Google+ account.. something goes wrong but dunno what.

This is my website http://www.powerlust.it/home

Can someone help me to fix these issues? I should to re-bring the website up this Monday..
Thanks

Guido.

[Emanuel Mathias Canova]

The same error!!!!!

The support here is a fucking sh*t!!

[Emanuel Mathias Canova]

I see that you fix the problem!!

Please.. how you fix?? 😀

[NDJSupport]

Hi,

There might be some conflicting issue with other plugins or theme installed in your WordPress Site . Can you please try disabling the plugins one by one and switch to default theme and see if anyone of them is causing the issues and let me know .

If it still doesn’t work please let me know .

Thanks !