Oracle PL/SQL Function Syntax

This is a simple function that I copied from a tutorial.

The following error is triggered when I try to compile:

"The name in the text editor differs from the specified object name"

Here is the function:

 

CREATE OR REPLACE FUNCTION DBM_Add_ColComment 
    
RETURN VARCHAR(20);
 IS 

    emp_name VARCHAR(20); 
 
    BEGIN 
 
        SELECT ename INTO emp_name
        FROM employee WHERE EmpNo = 6;
        
        RETURN emp_name;

 END;
 / 

Select allOpen in new window

This statement executes in the SQL window:

SELECT ename
        FROM employee WHERE EmpNo = 6;

What am I missing?

Thanks,