C:\Users\songdejun>app-inspector -u emulator-5554

uiautomator-client.js:42:14 [master] pid:11208 C:\Program Files\nodejs\node-global\node_modules\app-inspector\node_modules\uiautomatorwd\app\build\outputs\apk\debug\app-debug.apk not found, please resolve and reinstall android driver
Error: >> uiautomator-client.js:42:14 [master] pid:11208 C:\Program Files\nodejs\node-global\node_modules\app-inspector\node_modules\uiautomatorwd\app\build\outputs\apk\debug\app-debug.apk not found, please resolve and reinstall android driver
at Logger.error (C:\Program Files\nodejs\node-global\node_modules\app-inspector\node_modules\xlogger\lib\xlogger.js:169:9)
at UIAutomator.init (C:\Program Files\nodejs\node-global\node_modules\app-inspector\node_modules\uiautomatorwd\lib\uiautomator-client.js:42:14)
at UIAutomator.init.throw ()
at onRejected (C:\Program Files\nodejs\node-global\node_modules\app-inspector\node_modules\co\index.js:81:24)
at process._tickCallback (internal/process/next_tick.js:68:7)