问题：app-inspector之前一直是好的，忽然抽风一直挂掉提示Internal Server Error，用macaca doctor检查环境也是好的，就是报错
报错日志：
server.js:16:12 [master] pid:24652 server start with config:
{
port: 5678,
verbose: true,
udid: '25ff8f554eec8da683a00f0310291573f313a72f',
ip: '172.16.48.223',
host: 'wangruideMacBook-Pro-2.local',
loaded_time: '2019-09-19 13:20:48'
}
app-inspector.js:45:12 [master] pid:24652 server start at: http://172.16.48.223:5678
xctest-client.js:56:14 [master] pid:24652 project path: /usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:283:14 [master] pid:24652 xcode version: 10.3
XCTestWD version: 1.4.18
xctest-client.js:309:14 [master] pid:24652 Fail to start xctest: Error: ENOENT: no such file or directory, scandir '/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/build/Build/Products'
Error: ENOENT: no such file or directory, scandir '/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/build/Build/Products'
at Object.readdirSync (fs.js:795:3)
at /usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/lib/xctest-client.js:189:26
at new Promise ()
at XCTest.startBootstrap (/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/lib/xctest-client.js:182:12)
at startBootstrap.next ()
at onFulfilled (/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/co/index.js:65:19)
at /usr/local/homebrew/lib/node_modules/app-inspector/node_modules/co/index.js:54:5
at new Promise ()
at co (/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/co/index.js:50:10)
at toPromise (/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/co/index.js:118:63) {
errno: -2,
syscall: 'scandir',
code: 'ENOENT',
path: '/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/build/Build/Products'
}
iOS device started: 25ff8f554eec8da683a00f0310291573f313a72f
inspector start at: http://172.16.48.223:5678
<-- GET /
helper.js:94:16 [master] pid:24652 xctest client proxy error with: Error: connect ECONNREFUSED 127.0.0.1:8001
Error: connect ECONNREFUSED 127.0.0.1:8001
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1056:14)
分析：就是缺少Build/Products，试了很多方法包括重装都一直报错，以为是xcode的bug
解决：直接在这个路径手动增加缺少的目录，/usr/local/homebrew/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/build/Build/Products，新建Build，在Build里新建Products，就解决啦
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