invalid data type conversion

  Explanation:  1.  source value is negative and destination  data
  type is unsigned, or 2.  possible bad parameter, such as invalid
  input/output type, invalid option value, or 3.  float over/under
  flow  (on  ALPHA/VMS),  or  4.   positive/Negative  Infinity (on
  ALPHA/VMS), or 5.  reserved operand error.

  User Action:  Ensure that the source value is positive  and  the
  destination  data  type  is signed, or the parameters are passed
  correctly, or contact your  Oracle  support  representative  for
  assistance.