Error that the reCAPTCHA site owner needs to see: Invalid site key

[LowkeyM]

Error that site owner needs to see: Invalid site key, can anyone help those using Google reCAPTCHA encountering such error? Despite my willingness to help in Turkish forums, none of our friends helped or could help, and I found the solution on an English forum. I hope this will be useful for friends facing this issue like me, good forums