How to avoid invalid object name error while creating stored procedure?

Question

I have created two stored procedure from a single table:

Database name : sampleDemo

USE sampleDemo
GO

ALTER PROCEDURE employeeList    
    @city VARCHAR(50)
AS
BEGIN
    SELECT
        emp_id, emp_dob
    FROM 
        employee
    WHERE 
        emp_city = @city
    ORDER BY 
        emp_id
END;

This one working completely fine but the other one:

USE sampleDemo
GO

ALTER PROCEDURE sp_listofemp 
    @city VARCHAR(50)
AS
BEGIN
    SELECT emp_id, emp_name, emp_city, emp_dob
    FROM employee
    WHERE emp_city = @city
    ORDER BY emp_id
END;

Though both the procedure are almost same still the second one is throwing error

Msg 208, Level 16, State 6, Procedure sp_listofemp, Line 2 [Batch Start Line 2]
Invalid object name 'sp_listofemp'

Can someone help me where I am doing wrong?