Can't dup Fixnum when calling t(), what should I do?

Question

Ruby on Rails

View file: ru.yml
t('comments', @post.comments.count)

ru:
  comments:
    one: "Комментарий %{count}"
    other: "Комментариев %{count}"

Error occurs:
Why?

Answer 1

t('comments', count: @post.comments.count)