Teradata SQL Syntax error: All expressions in a derived table must have an explicit name.

The below statement threw this error: SQL Syntax error: All expressions in a derived table must have an explicit name.

select v1.* from dim_y v1
join (
select nk_record_id, count(*)  from dim_y
group by nk_record_id
having count(*) > 1
) v2
on v1.nk_record_id = v2.nk_record_id

Corrected version:

select v1.* from dim_y v1
join (
select nk_record_id, count(*) cnt  from dim_y
group by nk_record_id
having count(*) > 1
) v2
on v1.nk_record_id = v2.nk_record_id