grape on "[Theme: evolve] Re-captcha contact form error"

I am having the same issue. When testing I fill in all fields:
Name, email, subject and message, and click the reCaptcha box, hit send - and I get the Error: "Please check if you've filled all the fields with valid information. Thank you."
My site key and secret key are entered correctly.
Any ideas as to why it is failing? thanks so much