SQL & PL/SQL :: Procedure With Default Columns

I have the following procedure...

CREATE OR REPLACE Procedure Updatetdef_normal_ranges (
i_tdef_range_id in number,
i_user_change_id in number default -1,
i_norm_range_low in number default NULL,

[Code]....

EXCEPTION

WHEN OTHERS THEN raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM); END Updatetdef_normal_ranges;

I am trying to execute it using the command

Execute Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1)

and I am getting the following error...

SQL> Execute Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1);
BEGIN Updatetdef_normal_ranges (i_tdef_range_id => 1, i_norn_range_high => 100.34, i_high_reflex_tdef_id => 100, i_low_reflex_tdef_id => 17, i_range_low_sched => -1); END;

*
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to
'UPDATETDEF_NORMAL_RANGES'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

If I replace the update statement with dbms_output statement this procedure works fine.