xcodebuild test. error in xcode10

[scvjx]

Mac OS. 10.2
xcode 10
iPhone device. iPhone xs max. iOS 12.

I installed the latest wda version and ran the command: xcodebuild -project /usr/local/var/WebDriverAgent/WebDriverAgent.xcodeproj -scheme WebDriverAgentRunner -destination "id=the correct udid " test

test failed
console log

writeDictToFile:1278 ==== Successfully wrote Manifest cache to /var/folders/xc/0q261_n978v_lmgj5jv120280000gn/C/com.apple.DeveloperTools/All/Xcode/EmbeddedAppDeltas/580670a900bdc3195cb7502f12a7821f/00008020-000349DE3684002E/ManifestCache.plist
2019-04-28 17:41:48.049555+0800 WebDriverAgentRunner-Runner[804:267935] Running tests...
2019-04-28 17:41:55.715 xcodebuild[10448:857161] [MT] IDETestOperationsObserverDebug: 11.909 elapsed -- Testing started completed.
2019-04-28 17:41:55.715 xcodebuild[10448:857161] [MT] IDETestOperationsObserverDebug: 0.000 sec, +0.000 sec -- start
2019-04-28 17:41:55.715 xcodebuild[10448:857161] [MT] IDETestOperationsObserverDebug: 11.909 sec, +11.909 sec -- end
2019-04-28 17:41:55.716 xcodebuild[10448:857161] Error Domain=IDETestOperationsObserverErrorDomain Code=6 "Early unexpected exit, operation never finished bootstrapping - no restart will be attempted" UserInfo={NSLocalizedDescription=Early unexpected exit, operation never finished bootstrapping - no restart will be attempted, NSUnderlyingError=0x7f83d7f306e0 {Error Domain=IDETestOperationsObserverErrorDomain Code=5 "Test runner exited before starting test execution." UserInfo={NSLocalizedDescription=Test runner exited before starting test execution., NSLocalizedRecoverySuggestion=If you believe this error represents a bug, please attach the result bundle at /Users/fangxingyuan/Library/Developer/Xcode/DerivedData/WebDriverAgent-glywsvkopnraroaumxstgpptvmor/Logs/Test/Test-WebDriverAgentRunner-2019.04.28_17-41-42-+0800.xcresult}}}

Testing failed:
WebDriverAgentRunner-Runner.app (804) encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. (Underlying error: Test runner exited before starting test execution.))
** TEST FAILED **