1212: overlay opsize exceeded - increase opsize 
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  This message applies only to the BLINKER OVERLAY FIXED overlay
  allocation method, and should not occur in normal operation.

  Normally, Blinker calculates the minimum required opsize at link time,
  and does not allow the opsize to be set below this minimum size (if
  you set the opsize to a value smaller than the minimum, Blinker will
  use the minimum instead).

  This message indicates that the Blinker overlay manager could not find
  space in the overlay area to load an overlay (the opsize was
  exceeded).  Increasing the overlay opsize by 1-2kb, and relinking the
  program should solve the problem, but if you receive this message,
  please call Blinker technical support with your serial number and full
  details of the circumstances leading to the problem.