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React Native:错误:升级后找不到符号

嗨,在导入我的React本机项目博览会和升级React之后,我遇到了以下问题。

C:\ Users \ user \ gramic \ android \ app \ src \ main \ java \ com \ shop \ MainApplication.java:5:错误:找不到符号导入com.facebook.react.ReactApplication; ^符号:类ReactApplication位置:包com.facebook.react C:\ Users \ user \ gramic \ android \ app \ src \ main \ java \ com \ shop \ MainApplication.java:13:错误:找不到符号导入com。 facebook.react.ReactNativeHost; ^符号:类ReactNativeHost位置:包com.facebook.react C:\ Users \ user \ gramic \ android \ app \ src \ main \ java \ com \ shop \ MainApplication.java:21:错误:找不到符号公共类MainApplication扩展应用程序实现ReactApplication {^符号:类ReactApplication C:

    package com.shop;

import android.app.Application;

import com.facebook.react.ReactApplication;
import com.oblador.vectoricons.VectorIconsPackage; …
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java android facebook reactjs react-native

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