Google reCAPTCHA V2 Response Error

Why am I getting that error on Google reCAPTCHA V2 response?

Hello, it's my first time posting here and I'm not good with such stuff as the one I'm posting right now

I have been trying to solve this issue for 2 days by now so I could use some help lol

This error "Please solve the captcha." is showing even if the captcha is verified so it's showing in the both cases (verified/unverified).

Thanks in advance.


<=========PHP Code ===========>

<code><pre>