Application GaGaMall has not been registered？

[idisfkj]

Application GaGaMall has not been registered. This is either due to a require() error during initialization or failure to call AppRegistry.registerComponent.

[jiangqqlmj]

这个问题，两种解决方案:
1.模拟器测试一下，直接运行命令。
2.真机和电脑连接同一个Wifi，然后真机设置电脑的IP和默认8081端口，运行命令。
注意一定要查看一下React Native Server打开了没

[jiangqqlmj]

另外的可能，你是不是也有其他项目运行着？可以先关闭其他一切项目，运行本项目即可

[usmanabid]

i am also having the same issue and i am using
"dependencies": {
"react": "16.4.1",
"react-native": "0.55.0"
},
"devDependencies": {
"babel-jest": "23.6.0",
"babel-preset-react-native": "5.0.2",
"jest": "23.6.0",
"react-test-renderer": "16.4.1"
},
"jest": {
"preset": "react-native"
}
}
can any one suggest any solution about thi sproblem i have spent 2 days at this issue and this doesnot seems to be going anywhere