the left hand  side  of  the  assignment  expression  is  not  a
  variable

  Explanation:  The left side of an assignment expression in a GET
  command  must  be a host variable.  For preprocessed statements,
  the variable must be a host  language  variable.   For  Callable
  RDO, the variable must be "!VAL".

  User Action:  Use a  host  variable  in  the  left  side  of  an
  assignment expression.