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Unable to load script.Make sure you’are either running a Metro server(run ‘react-native start’)….

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react-native报错:Unable to load script.Make sure you’are either running a Metro server(run ‘react-native start’)….


可能的原因

： 

直接在项目下运行：
react-native run-android


解决办法

：

1.执行 

$ react-native start
$ react-native run-android

2. 再次执行 

react-native run-android

loading 30s …..