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.