Component Not Found - Joomla 1.5

A friend’s site that I’ve worked on in the past suddenly has a Component not found error on the Calendar page (Joomla 1.5 CMS) although the Calendar displays direclty beneath it anyways and still has some functionality.

At least for now I’m hiding the component ‘error box’, but there is a missing /com_scheduler/codebase/sources/locale_recurring_en.js which is causing an error and no solution that I’ve found so far to remedy it.

This site has been functioning fine for a couple years or so.

Is there a solution for removing the error and continuing to use the still functioning calendar on a visible page?