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我已经使用 wtforms 创建了一个注册表单。我在其中使用 FormField 以便我不必再次重复表单的某些元素。但是每当我点击提交按钮时，它总是在 validate_on_submit 方法调用时给我错误。不明白为什么会这样。

我form.py的如下：

class ProfileInfoForm(Form):
    firstname = TextField('firstname', validators=
                          [validators.Required("Please enter First name.")])
    lastname = TextField('lastname', validators=
                         [validators.Required("Please enter Last name.")])
    email = EmailField('email', validators=
                       [validators.Required("Please enter your valid email.")])
    gender = RadioField('gender', validators=
                        [validators.Required("Please select gender")],
                        choices=[('female', 'Female'), ('male', 'Male')])
    dob = TextField('dob', validators=
                    [validators.Required("Please select date of birth.")])
    languages = SelectMultipleField('languages', choices=[('', '')],
                                    validators=
                                    [validators.Required("Please select\
                                                         atleast one \
                                                         language.")])


class RegistrationForm(Form):
    profilefield = FormField(ProfileInfoForm)
    password = PasswordField('password',
                             validators=
                             [validators.Required("Please enter …