[Plugin: FBF Facebook page Feed Widget] Notice: Undefined variable: returnMarkup

I am wondering if this kind of Facebook Page Feed plugins are going to stop working due to facebook stating

The Live Stream plugin will be removed on October 3, 2012. We recommend using the Comments Box plugin instead. Please migrate your Live Stream plugins as soon as possible. On October 3rd, if your app is still using the Live Stream plugin, we will render the Comments Box plugin in its place. While it offers similar functionality, there are a few functional differences. Please see below for more details.