Google plus one button is not working (Google plus one button error)

I have setup the Google plus one button on my site.

When I (Or anyone else) clicks the开发者_运维知识库 +1 button it adds to the counter for 5 seconds, then red exclamation appears."

Make sure the page is accessible to Google (i.e. it's not behind a firewall, it's a staging server, etc)

If your site or page is blocked with an htaccess password-protected file then Google can't see it, and it won't let you Plus-One.

The same problem happens when you're developping under a localhost, you have to be on a distant server to have it work properly.