FATAL 208

Overlay manger not installed.

Your program is calling an overlaid procedure or function,
but the overlay manager is not installed. Most likely, you
are not calling OvrInit, or the call to OvrInit failed. Note
that, if you have initialization code in any of your overlaid
units, you must create an additional non-overlaid unit which
calls OvrInit, and use the unit before any of the overlaid
units.