hint:this error often happens when you are running the packager(local dev server)
1、現象
執行一個 react native 專案到 genymotion 模擬器上，出現 如標題所示 錯誤，介面是一片紅色（當時未截圖）。
webstorm 中提示
終端裡面提示
最後按照 webstorm 中的提示，利用命令
1、 lsof -i :8081
檢視端口占用情況
kill -9 <PID>
2、幹掉那個佔用的 pid ，再次執行 react-native run-android
執行成功
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