What error POSTGRESQL procedure?

my procedure

CREATE OR REPLACE FUNCTION auto_increment_version(id bigint)
 RETURNS bigint
LANGUAGE plpgsql
AS $$
DECLARE
 res BIGINT;
BEGIN
 SELECT COUNT(*)
 INTO res
 FROM appsellschema."product-version"
 WHERE template_id = id;
 RETURN res+1;
END;
$$;

SELECT appsellschema.auto_increment_version(1);

In the console error
[2018-02-01 12:50:40] [42702] ERROR: column reference "id" is ambiguous
[2018-02-01 12:50:40] Detail: It could refer to either a PL/pgSQL variable or a table column.
[2018-02-01 12:50:40] Where: PL/pgSQL function appsellschema.auto_increment_version(bigint) line 6 at SQL statement
[2018-02-01 12:50:40] Summary: 1 of 1 statements executed, 1 failed in 33ms (46 symbols in file)

Where to dig?