I have just added Google Analytics (and reCaptcha) to a form that was working (to try and prevent spammers from abusing the form) and the form now generates an error when I try to submit it. "Failed...

Hello, I have at this site a form and want to add ReCaptcha. ReCatcha Joomla-Plugin is active; I also added the code in NP-site-settings. But no ReCaptcha field appears? Thanks for help!