I've placed the Facebook Like button iframe code on my website. When I test it, I receive an error:

"name" likes this. · Error. Clicking on Error gives:

You failed to provide a valid list of administrators. You need to supply the administrators using either a "fb:app_id" meta tag or a "fb:admins" meta tag to specify a comma-delimited list of Facebook users.

If I view the source of the page, I can see:

<meta property="fb:admins" content="529447119" />

What do I need to do to prevent the error? Do you receive the error