Ummm...did you *READ* the page that RndMe linked to?
As of 1.9, the event name string "hover" is no longer supported as a synonym for "mouseenter mouseleave". This allows applications to attach and trigger a custom "hover" event. Changing existing code is a simple find/replace, and the "hover" pseudo-event is also supported in the jQuery Migrate plugin to simplify migration.
So either do the replace of use that plugin. No?