React native 在redux表单中设置服务器端错误

我想在redux表单

字段中设置服务器端错误。我正在尝试：

<FormContatiner>
    <Field
        icon={ 'user' }
        returnKeyType={ 'next' }
        withRef
        ref={ (componentRef) => this.firstName = componentRef }
        refField="firstName"
        onEnter={() => {
            this.lastName.getRenderedComponent().refs.lastName.focus()
        }}
        placeholder={ consText.FIRST_NAME }
        component={ RenderInput }
        name={'first_name'}
    />

    <Field
        icon={ 'user' }
        returnKeyType={ 'next' }
        withRef
        ref={ (componentRef) => this.lastName = componentRef }
        refField="lastName"
        onEnter={() => {
            this.userName.getRenderedComponent().refs.userName.focus()
        }}
        placeholder={ consText.LAST_NAME }
        component={ RenderInput }
        name={ 'last_name' }
    />

    <Field
        icon={ 'user' }
        returnKeyType={ 'next' }
        withRef
        ref={ (componentRef) => this.userName = componentRef }
        refField={ 'userName' }
        onEnter={() => {
            this.email.getRenderedComponent().refs.email.focus()
        }}
        placeholder={ consText.USERNAME }
        component={ RenderInput }
        name={ 'username' }
        validate={ [] }
    />
</FormContatiner>

这是
this.props.register
函数：

export const register = (user, navigation) => {

    return async (dispatch) => {
        dispatch({
            type: REGISTER_REQUEST
        })
        try {
            await axios.post(URL + 'rest_users', user)
                .then(function (response) {
                    console.log(response);
                    if(response.data.error==true) {
                         dispatch({
                            type: REGISTER_FAILER,
                            payload: response.data.errorMsg
                         });
                         throw new SubmissionError({ 
                             username: response.data.errorMsg.username[0],
                             _error: 'Login failed!'
                         });
                     }
            });
        } catch (error) {
            console.log(error);
        }
    };
};

我得到了这个错误：

SubmissionError{错误：{…}，消息：“提交验证失败”，
名称：“SubmissionError”，堆栈：“SubmissionError:提交验证”
失败↵ 在h…rs\node_modules\expo\tools\hassassetfiles:6502:9）}

错误是什么？获取此错误SubmissionError{错误：{…}，消息：“提交验证失败”，名称：“SubmissionError”，堆栈：“SubmissionError:提交验证失败”↵    在h…rs\node\u modules\expo\tools\hassassetfiles:6502:9）“}我正在跟踪此链接，但我被卡住了，我不知道我哪里出错了，您收到了一个错误，因为您正在抛出SubmissionError是的，我已经收到用户名，退出了错误，我想在用户名字段上显示此错误
export const register = (user, navigation) => {

    return async (dispatch) => {
        dispatch({
            type: REGISTER_REQUEST
        })
        try {
            await axios.post(URL + 'rest_users', user)
                .then(function (response) {
                    console.log(response);
                    if(response.data.error==true) {
                         dispatch({
                            type: REGISTER_FAILER,
                            payload: response.data.errorMsg
                         });
                         throw new SubmissionError({ 
                             username: response.data.errorMsg.username[0],
                             _error: 'Login failed!'
                         });
                     }
            });
        } catch (error) {
            console.log(error);
        }
    };
};