1216: overlay manager unable to resume 
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  This message indicates that a call to the overlay manager resume
  function BLIOVLRES() has been made, and that the overlay manager was
  unable to re-allocate memory for the overlay pool in order to resume
  executing overlays.

  The probable cause of this message is that subsequent to the call to
  the overlay manager suspend function, BLIOVLSUS(), the memory
  previously used for the overlay pool was allocated to a request for
  conventional memory and still remains allocated. In order to resume,
  the overlay manager requires an area of conventional memory at least
  as large as the previous overlay pool.