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Code of trigger not working

Can anyone help me in finding whay the below code is not working. It says "invalid character"
It is a trigger on table teacher that restricts from updating and deleting of the records on weekends.

Code:

CREATE OR REPLACE TRIGGER NOT_WORKING _HOUR 

BEFORE INSERT OR DELETE OR UPDATE ON TEACHER 



BEGIN 

IF (TO_CHAR(SYSDATE,'DY') IN ('SAT','SUN')) THEN 

DBMS_OUTPUT.PUT_LINE('SORRY! YOU CANNOT UPDATE OR DELETE ON WEEKENDS'); 

END IF; 

END

Re: Code of trigger not working

Your name of the trigger contains a space.