启动以后，网页端显示 Internal Server Error，求解答，谢谢！

server.js:16:12 [master] pid:8647 server start with config:
{ port: 5678,
verbose: true,
udid: '92152c9745d203e067835a0a82dec73ce27124f7',
ip: '10.42.32.117',
host: 'spryMBP.local',
loaded_time: '2017-05-11 16:18:39' }
app-inspector.js:43:12 [master] pid:8647 server start at: http://10.42.32.117:5678
xctest-client.js:63:14 [master] pid:8647 project path: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client start with port: 8001
xctest-client.js:243:14 [master] pid:8647 xcode version: 8.2.1
XCTestWD version: 1.0.7
xctest-client.js:191:14 [master] pid:8647 2017-05-11 16:18:40.981 xcodebuild[8653:201519] IDETestOperationsObserverDebug: Writing diagnostic log for test session to:
/Users/xyao/Library/Developer/Xcode/DerivedData/XCTestWD-evljajykmolwzobrozpobiggeeea/Logs/Test/4E65C771-BD39-4186-AD8A-09BA20862314/Session-XCTestWDUITests-2017-05-11_161840-oXuZtN.log

xctest-client.js:192:14 [master] pid:8647 please check project: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:191:14 [master] pid:8647 2017-05-11 16:18:40.982 xcodebuild[8653:201510] [MT] IDETestOperationsObserverDebug: (A37D032F-2F93-4F09-9593-77F68DFBA852) Beginning test session XCTestWDUITests-A37D032F-2F93-4F09-9593-77F68DFBA852 at 2017-05-11 16:18:40.980 with Xcode 8C1002 on target {
deviceSerialNumber: C39QKKFNGRWF
identifier: 92152c9745d203e067835a0a82dec73ce27124f7
deviceClass: iPhone
deviceName: sp_iPhone6S Plus_s2
deviceIdentifier: 92152c9745d203e067835a0a82dec73ce27124f7
productVersion: 10.2.1
buildVersion: 14D27
deviceSoftwareVersion: 10.2.1 (14D27)
deviceArchitecture: arm64
deviceTotalCapacity: 11747463168
deviceAvailableCapacity: 2078658560
deviceIsTransient: NO
ignored: NO
deviceIsBusy: NO
deviceIsActivated: YES
deviceActivationState: Activated
deviceType:
supportedDeviceFamilies: (
1
)
applications: (null)
provisioningProfiles: (null)
activityProgress: -2
activityTitle:

hasInternalSupport: NO
isSupportedOS: YES
developerDiskMountError: (null)
(null)
} (10.2.1 (14D27))

xctest-client.js:192:14 [master] pid:8647 please check project: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:191:14 [master] pid:8647 2017-05-11 16:18:41.212 xcodebuild[8653:201510] Error Domain=IDETestOperationsObserverErrorDomain Code=3 "Test operation was canceled. If you believe this error represents a bug, please attach the log file at /Users/xyao/Library/Developer/Xcode/DerivedData/XCTestWD-evljajykmolwzobrozpobiggeeea/Logs/Test/4E65C771-BD39-4186-AD8A-09BA20862314/Session-XCTestWDUITests-2017-05-11_161840-oXuZtN.log" UserInfo={NSLocalizedDescription=Test operation was canceled. If you believe this error represents a bug, please attach the log file at /Users/xyao/Library/Developer/Xcode/DerivedData/XCTestWD-evljajykmolwzobrozpobiggeeea/Logs/Test/4E65C771-BD39-4186-AD8A-09BA20862314/Session-XCTestWDUITests-2017-05-11_161840-oXuZtN.log}

xctest-client.js:192:14 [master] pid:8647 please check project: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:191:14 [master] pid:8647
Testing failed:
Signing for "XCTestWD" requires a development team. Select a development team in the project editor.

xctest-client.js:192:14 [master] pid:8647 please check project: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:191:14 [master] pid:8647 Code signing is required for product type 'Application' in SDK 'iOS 10.2'
** TEST FAILED **

The following build commands failed:
Check dependencies
(1 failure)

xctest-client.js:192:14 [master] pid:8647 please check project: /usr/local/lib/node_modules/app-inspector/node_modules/xctestwd/XCTestWD/XCTestWD.xcodeproj
xctest-client.js:279:14 [master] pid:8647 killing deviceLogProc pid: 8650
xctest-client.js:284:14 [master] pid:8647 killing runnerProc pid: 8653
xctest-client.js:290:14 [master] pid:8647 killing iproxyProc pid: 8652
xctest-client.js:202:14 [master] pid:8647 xctest client exit with code: 65, signal: null
xctest-client.js:157:16 [master] pid:8647 deviceconsole exit with code: null, signal: SIGKILL
xctest-client.js:271:14 [master] pid:8647 Fail to start xctest: undefined
undefined
iOS device started: 92152c9745d203e067835a0a82dec73ce27124f7
inspector start at: http://10.42.32.117:5678
xctest-client.js:230:14 [master] pid:8647 iproxy exit with code: null, signal: SIGKILL
<-- GET /
helper.js:97:16 [master] pid:8647 xctest client proxy error with: Error: connect ECONNREFUSED 127.0.0.1:8001

Error: connect ECONNREFUSED 127.0.0.1:8001
at Object.exports._errnoException (util.js:1008:11)
at exports._exceptionWithHostPort (util.js:1031:20)
at TCPConnectWrap.afterConnect as oncomplete