我正在使用React，Apollo和Next.js构建一个项目。我试图将react-apollo更新到3.1.3，现在查看网站时出现以下错误。
不变违背：在上下文中找不到或作为选项传入的“client”。请将根组件 Package 在中，或通过选项传入ApolloClient示例。
如果我把react-apollo软件包降级到2.5.8，它可以正常工作，所以我想在2.5和3.x之间有什么变化，但在react-apollo或next-with-apollo文档中找不到任何东西来说明可能是什么。
withData.js

import withApollo from 'next-with-apollo';
import ApolloClient from 'apollo-boost';
import { endpoint } from '../config';

function createClient({ headers }) {
    return new ApolloClient({
        uri: endpoint,
        request: operation => {
            operation.setContext({
                fetchOptions: {
                    credentials: 'include'
                },
                headers
            });
        },
        // local data
        clientState: {
            resolvers: {
                Mutation: {}
            },
            defaults: {}
        }
    });
}

export default withApollo(createClient);

_app.js

import App from 'next/app';
import { ApolloProvider } from 'react-apollo';
import Page from '../components/Page';
import { Overlay } from '../components/styles/Overlay';
import withData from '../lib/withData';

class MyApp extends App {
    static async getInitialProps({ Component, ctx }) {
        let pageProps = {};
        if (Component.getInitialProps) {
            pageProps = await Component.getInitialProps(ctx);
        }

        // this exposes the query to the user
        pageProps.query = ctx.query;
        return { pageProps };
    }

    render() {
        const { Component, apollo, pageProps } = this.props;

        return (
            <ApolloProvider client={apollo}>
                <Overlay id="page-overlay" />
                <Page>
                    <Component {...pageProps} />
                </Page>
            </ApolloProvider>
        );
    }
}

export default withData(MyApp);