学习react-navigation，但是一直报异常什么原因？？ 哪个大神知道？？
error: bundling failed: Error: Unable to resolve module `react-navigation` from `App.js`: react-navigation could not be found within the project or in these directories:
../../node_modules
error: bundling failed: Error: Unable to resolve module `react-navigation` from `App.js`: react-navigation could not be found within the project or in these directories:
../../node_modules
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