select id,count(imdb_id) problem

Hello community!

When I type a query in postgresql, like

select id,imdb_id,count(imdb_id) from "Movies" where id<10 group by
imdb_id;

it says: column "Movies.id" must appear in the GROUP BY clause or be
used in an aggregate function
Where is the error?
What is the right spelling of this query?

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