Rails simple_form text_area不显示错误

我用simple_form创建了一个Rails表单,如下所示:

= simple_form_for @new_biz, url: new_business_post_path, html: {:class => "customForm1", :method => "post"} do |f|

    = f.input :business_name, label: false, :input_html => {:value => @wat.business_name, :readonly => true}
    = f.input :wat_id, :as => :hidden, :input_html => {:value => @wat.id}
    = f.input :first_name
    = f.input :last_name
    = f.input :email
    = f.input :phone, :label => "Phone number"
    = f.label "Personal Message"
    = f.text_area :message, label: false
    = f.submit "Submit"

和验证:

validates :first_name, presence: {:message => "Please enter the first name."}
validates :last_name, presence: {:message => "Please enter the last name."}
validates :phone, presence: {:message => "Please enter the phone number"}
validates :message, presence: {:message => "Please enter a personal message"}

除text_area字段外,所有验证均按预期显示。我似乎找不到其他有这个问题的人。非常感谢您的建议,谢谢。