Facebook Like button no longer working

The “like” button on my blog is no longer working. When I click on it, it show the count, but then displays a red error message (from Facebook) that reads:

“The page failed to provide a valid list of administrators. It needs to specify the administrators using either a “fb:app_id” meta tag, or using a “fb:admins” meta tag to specify a comma-delimited list of Facebook users.”

I have tried deactivating the plugin and restarting, I have tried installing other “like” plugins. Nothing works. I even went to Facebook Insights and linked it to my page by adding a meta tag in my header to include the admin id…still nothing.

I know nothing about ccs or any of the fancy code stuff. Can anyone help me figure out how to fix this issue?