Syntax error: Expected end of input but got “(” at [2:11] [closed]

I’m following a video from Google Data Analytics for a query on Bigquery. For some reason, even though I copied exactly what the person in the video wrote, I keep getting an error with the opening of CONCAT. It keeps saying ‘expected end of input but got “(“‘ and underlines ‘(Warehouse.state,’. Can anyone help, I’m not sure what it wants me to do.

I bolded the part that is giving me trouble and added a picture of what the instructor wrote here.

SELECT Warehouse.warehouse_id
    CONCAT**(Warehouse.state,** ': ', Warehouse.warehouse_alias) AS warehouse_name,
    COUNT(Orders.orders_id) AS number_of_orders, 
    (SELECT
        COUNT(*) 
    FROM warehouse_orders.orders Orders) AS total_orders,
    CASE 
        WHEN COUNT(Orders.order_id)/(SELECT COUNT(*) FROM warehouse_orders.orders Orders) <= .20 THEN "Fufilled 0-20% of Orders"
        WHEN COUNT(Orders.order_id)/(SELECT COUNT(*) FROM warehouse_orders.orders Orders) > .20 AND 
        COUNT(Orders.order_id)/(SELECT COUNT(*) FROM warehouse_orders.orders Orders) <= .60 THEN "Fufilled 20-60% of Orders"
        ELSE "Fufilled more than 60% of Orders"
        END AS fufillment_summary
 FROM warehouse_orders.warehouse Warehouse

 LEFT JOIN warehouse_orders.orders Orders
 ON Orders.warehouse_id = Warehouse.warehouse_id
 GROUP BY Warehouse.warehouse_id, warehouse_name
 HAVING COUNT(Orders.order_id) > 0