1210: overlay has been prematurely freed 
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  This message will only occur when using Clipper Summer '87 and the
  dynamic allocation method for overlays. This message indicates that
  the memory assigned to an overlay has been prematurely freed by
  Clipper's memory management routines, which can happen under very
  tight memory conditions.

  This is a Clipper Summer '87 error which the Blinker overlay manager
  checks for whenever it manipulates dynamic memory.

  Do not confuse this message with the Clipper 5.01 internal error
  message 1210.