ORA-02035 error when execute storedproc

Question

I'm using Oracle817 release 3.
when I use proc/c++ program execute a storedproc ,occur error "ORA-02035: illegal bundled operation combination". Program source:
...connect to server8.0.5
     for(i=0;i<20;i++)
          EXEC SQL EXECUTE
               BEGIN
                    ABC(:s,:s,:j:i_ind);
               END;
          END-EXEC;
          printf("execute succ[%d]i[%s]\n",i,s);          
...disconnect from server
errexit:
     sql_error();
     return 1;
void sql_error()
Error String:
connect succ
execute succ[0]i[2 ]
error:ORA-02035: illegal bundled operation combination
I rewrite program by using OCI,but error idem.
when I connect to Oracle8.1.6,Error is not appear.

Answer 1

procedure ABC source:
create or replace procedure abc(a varchar2,b varchar2,c out number) is
begin
c:=2;
return;
end abc;
if "c" is not a out parameter,error do not appear.