Fatal Error - post-indexer.php on line 225 (with Live Stream Widget)

I have a problem with the post indexer plugin on my site. I'm using the latest version of BuddyPesss and Wordpress.

Essentially in my dashboard I get the following error:

Fatal error: Call to undefined function get_blog_status() in /home/***mydomain***/public_html/wp-content/plugins/post-indexer/post-indexer.php on line 225

This error also appears whenever I now try to add or delete a post.

Please advise?

Thanks
Rob.