user can’t sign up in website

Hello
When a new user wants to register on my site, he encounters an error. After registration, WordPress gives an error that your site is facing a serious problem, and if he repeats it a second time, the site gives an error that this email address is wrong. Can you help me? Where is the problem?
Thank you

Hello,

Thank you so much for contacting our support center.

To better assist you, could you kindly test the functionality with default WordPress themes such as TwentyTwenty or WooCommerce Storefront? This will help us determine whether the issue stems from our theme or elsewhere.

Regards

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