WITH ... AS statement not working as expected

I get this error: It arises when I try to execute the following query:

with expensive_service as (
    select s1.*
    from service s1, service s2
    where s1.price > s2.price
)
select * 
from service except expensive_service;

I was trying to implement WITH ... AS (link to PostgreSQL docs). This query gives me the desired output I'm looking for:

select * 
from service except ( 
    select s1.*
    from service s1, service s2
    where s1.price > s2.price
)

Any aid directing me where the error lies would be greatly appreciated!