sql - Procedure created with compilation errors - but can't find error -

i have procedure can't find error is:

create or replace procedure add_grade (     studen_id in varchar2(6),     sec_id in number(6),     new_grade in char (1) )  begin      update enrollment      set grade = new_grade      s_id = studen_id , c_sec_id = sec_id; end; / 

run query ..

 select * user_errors name ='add_grade'  

and youll have error