PostgreSQL column "id" referenced in foreign key constraint does not exist SQL state: 42703

Question

I have a table named 'country'. with an identity column called 'id'

ALTER TABLE IF EXISTS public.country
    ADD COLUMN "id " integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 );

I also have a table named 'county' in which I have a reference to the id of the previous table 'country_id'

When I am trying to set cascade actions

ALTER TABLE county
DROP CONSTRAINT country_id,
ADD CONSTRAINT country_id
FOREIGN KEY (country_id)
REFERENCES country (id)
ON UPDATE CASCADE ON DELETE SET NULL;

I get back 'column "id" referenced in foreign key constraint does not exist SQL state: 42703'

What am I doing wrong? Thanks a lot!

I have tried the same code for other tables and it worked.