flask-wtf中使用RecaptchaField报RECAPTCHA_PUBLIC_KEY config not set错误

第一次使用flask-wtf的RecaptchaField，定义如下

配置文件设置

    # WTF 设置
    WTF_I18N_ENABLED = False
    SECRET_KEY = os.getenv('SECRET_KEY', 'some secret words') or 'my secert key dfdfdfdfdfdf'
    RECAPTCHA_PRIVATE_KRY = os.getenv('RECAPTCHA_PRIVATE_KRY', 'some recapcha private key words') or 'my secert key dghghghghgh'
    RECAPTCHA_PUBLIC_KRY = os.getenv('RECAPTCHA_PUBLIC_KRY', 'some recapcha public key words') or 'mertefghdfgsdsasdfasdfghjg'

Form表单定义

class RegistForm(MyBaseForm):
    userName = StringField(label='用户名:', validators=[DataRequired(message='必须填写用户名'), Length(min=2, max=20)])
    email = StringField(label='邮箱:', validators=[DataRequired(message='必须提供注册邮箱'), Email(message='所提供邮箱需满足邮箱格式')])
    password = PasswordField(label='密码:', validators=[DataRequired(message='必须提供登录密码'), Length(min=4, max=20, message='密码长度必须在2-20个字符之间')])
    confirm = PasswordField(label='重复密码:', validators=[DataRequired(message='请重复输入密码'), EqualTo('password', message='重复输入密码需与前密码一致')])
    recaptcha = RecaptchaField()

    submit = SubmitField(label='注册')

确定在运行中current_app中可以查到config中的['RECAPTCHA_PUBLIC_KRY']

但在运行中报如下错误

 

跟踪在widgets.py中报这个错误

    def __call__(self, field, error=None, **kwargs):
        """Returns the recaptcha input HTML."""

        try:
            public_key = current_app.config["RECAPTCHA_PUBLIC_KEY"]
        except KeyError:
            raise RuntimeError("RECAPTCHA_PUBLIC_KEY config not set") from None

        return self.recaptcha_html(public_key)

调试跟踪确定有值

请问有大神可以解决吗？