Input error: k: Format of site key was invalid

Hi, i'am using a recaptcha code in my java web application with private and public key of my client site, and i want to test it in localhost.But...my page display this message :Input error: k: Format of site key was invalid How I can fix it?TksRAF -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.