Internal Error #650

  (#95972) Problem occurred during block evaluation from within a custom
  error handler?  A message preceding the error indicated that the
  program had run out of stack space: "Processor Stack Overflow."

  () I got this error to occur by specifying an undefined ERRORBLOCK().      ~
  In other words, the function call in the codeblock that I passed to
  ERRORBLOCK() had a symbol reference in it that was not linked to the
  program.  .RTLink generated an "unresolved externals" message and
  indicated that "EXE may not execute properly."  I suspect, however,
  that this error has nothing at all to do with ERRORBLOCK()s in
  general, but, instead, has something to do with the evaluation of
  a NIL or undefined codeblock.