```ruby
class Micropost < ApplicationRecord
  belongs_to :user

  default_scope -> { order(created_at: :desc) }

  mount_uploader :picture, PictureUploader

  validates :user_id, presence: true
  validates :content, presence: true, length: { maximum: 140 }
  validate :picture_size

  private

  def picture_size
    erros.add(:picture, 'should be less than 5MB') if picture.size > 5.megabytes
  end
end
```

Fix bug not to add error
user
```ruby
class Micropost < ApplicationRecord
  belongs_to :user

  default_scope -> { order(created_at: :desc) }

  mount_uploader :picture, PictureUploader

  validates :user_id, presence: true
  validates :content, presence: true, length: { maximum: 140 }
  validate :picture_size

  private

  def picture_size
    errors.add(:picture, 'should be less than 5MB') if picture.size >
                                                       5.megabytes
  end
end
```
assistant