Run-Time Error 207:  Invalid floating point operation
 
This error occured because of one of the following:
 
  ■ A stack overflow occurred, with either alternate math
    or coprocessor.
 
  ■ A non-positive value was passed to the Ln function.
 
  ■ A negative value was passed to the Sqrt function.
 
  ■ The value passed to the Round or Trunc functions
    was not in the range of a LongInt
    (-2147483648..2147483647).