Error: Captcha : Invalid Captcha Code

[Rachel Sarratt]

Hi all,  I a complete nooby here so please be gentle with me.

I have started getting the error 'Captcha : Invalid Captcha Code' on my site for member sign up.

I've checked the keys and that did not help.

What is the Captcha Code and how can I fix it?

Thank you in advance

Rachel