Contact Form 7 ReCapt

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I added Recaptcha to Contact Form 7. I get the following error:

ERROR for site owner: Invalid site key

First, I generated new site/secret keys and tried again. Then I deleted the keys and removed the Recaptcha line from Contact Form 7, but I still get the error. I’d like to first find a way to remove the error and second find a way to make ReCaptcha work correctly.