specified data type can not be passed/returned by descriptor  or
  length

  Explanation:  The specified  data  type  for  the  parameter  or
  function  result  can  not  be  passed  or returned by mechanism
  DESCRIPTOR or LENGTH.

  User Action:  Change  the  specified  passing  mechanism  to  be
  by-reference  or  by-value,  or  change  the  data  type  of the
  parameter or return type.