Unable to load script.Make sure you're either running a metro server (run 'react-native start' )

Unable to load script.Make sure you're either running a metro server
(run 'react-native start' ) or that
your bundle 'index.android.bundle' is packaged correctly for release.

运行android的时候经常会遇到这个错误,有时候重启下服务可以解决,但是有时管用,我们需要查下android的mainApplication下面的 

public boolean getUseDeveloperSupport() {
  return BuildConfig.DEBUG;
}

这个方法BuildConfig导入的包是否是项目包名下的包,如果不是比如导入的是facebook下的包就会报错,而且也不好发现,直接删除导入的facebook就解决了

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