Hi!

I can't register a new user. After completing a registration form, it says 404 error - component not found.
www.radiojapan.ru/registration

I moved my site to another hosting service and upgraded K2 version at the same time so I'm not sure what's the cause.
I also noted that registration form uses com_users component while 404 error URL contains com_user instead.

Help? :)

Hmm,

For some reason the antispam extension could not determine that I am not a robot.
Can you try disabling this extension?

I disabled captcha in Users component and I was able to register account succesfully.

How is that related to each other? Disabling captcha at the registration form is a bad idea I believe :(

It really is.
Which captcha are you using? K2's or Joomla!'s default captcha?

Google ReCaptcha v2. The one where you click on a checkbox.

Actually both K2 and Joomla! offer captcha plugins, which one are you using?