[Steven Zahm]

@ Ben

re: I have been updating the plugins as often as possible. It doesn’t look like link has been updated since July…correct?
Right, the latest version is 2.0.2. Do you have version 2.0.2 installed?

What about my second comment? “since “it started recently” that hints to the possibility of a new plugin that was installed or a plugin update that is breaking the hook in WordPress Link hooks into to properly function. Which plugins have you installed or updated recently, try deactivating them to see if the error goes away.”

Have you temporarily deactivate other plugins to see if the error goes away? My guess is another plugin or maybe even the theme is improperly hooking into the WordPress wp_login action hook.