Recaptca Issue

Did anyone ever encounter this problem

We detected that your site is not verifying reCAPTCHA tokens. Please see our developer site for more information?


I don’t have an answer for you but I’m wondering if you could help me?
I keep getting this error message:

ERROR for site owner: Invalid key type

What does this mean about my recaptcha?

Where are these errors displaying? And what type of form?

The error I have is on the website itself and it’s a ninja form