1211: overlay manager stack overflow 
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  The Blinker overlay manager maintains a reload stack used in the
  management of dynamic overlays, and this stack has overflowed.  The
  most common cause of this error is uncontrolled or unintentional
  recursion within an overlaid procedure or function, where a particular
  procedure or function is calling itself repeatedly.

  Please increase your BLINKER PROCEDURE DEPTH when it is low, and check
  your code for unintentional recursion.