Unable to detect adb connected devices

Hi,

I have multiple devices connected to the system running appium device farm, but none of them are detected.

I get the following error after starting the server:

TypeError: Cannot read property 'getConnectedDevices' of undefined
    at AndroidDeviceManager.<anonymous> (/home/techm/.appium/appium-device-farm/node_modules/appium-device-farm/lib/device-managers/AndroidDeviceManager.js:83:48)
    at Generator.next (<anonymous>)
    at fulfilled (/home/techm/.appium/appium-device-farm/node_modules/appium-device-farm/lib/device-managers/AndroidDeviceManager.js:5:58)

Installed and ran using the following commands:

npm -g install appium@2.0.0-beta.21
appium driver install uiautomator2
appium plugin install --source=npm appium-device-farm
appium plugin install --source=npm appium-dashboard
appium server -ka 800 --use-plugins=device-farm,appium-dashboard  -pa /wd/hub --plugin-device-farm-platform=android

Here’s the full logs:

$ appium server -ka 800 --use-plugins=device-farm,appium-dashboard  -pa /wd/hub --plugin-device-farm-platform=android
(node:30327) ExperimentalWarning: Package name self resolution is an experimental feature. This feature could change at any time
[Appium] Attempting to load plugin device-farm...
In Con android
[Appium] Attempting to load plugin appium-dashboard...
[appium-dashboard] Video directory created /home/techm/.cache/appium-dashboard-plugin/videos
[Appium] Welcome to Appium v2.0.0-beta.21 (REV 28bc2fd99149bbc8462df8b9962786b7ee91966c)
[Appium] Non-default server args:
[Appium]   basePath: /wd/hub
[Appium]   keepAliveTimeout: 800
[Appium]   usePlugins: {
[Appium]     0: device-farm
[Appium]     1: appium-dashboard
[Appium]   }
[Appium] Attempting to load driver uiautomator2...
[device-farm] Device Farm Plugin will be served at http://localhost:4723/device-farm
[device-farm] If the appium server is started with different port other than 4723, then use the correct port number to access the device farm dashboard
TypeError: Cannot read property 'getConnectedDevices' of undefined
    at AndroidDeviceManager.<anonymous> (/home/techm/.appium/appium-device-farm/node_modules/appium-device-farm/lib/device-managers/AndroidDeviceManager.js:83:48)
    at Generator.next (<anonymous>)
    at fulfilled (/home/techm/.appium/appium-device-farm/node_modules/appium-device-farm/lib/device-managers/AndroidDeviceManager.js:5:58)
[device-farm] Device list updated: []
[appium-dashboard] Dashboard plugin is enabled and will be served at http://localhost:4723/dashboard
[appium-dashboard] If the appium server is started with different port other than 4723, then use the correct port number to access the device farm dashboard
[Appium] Appium REST http interface listener started on 0.0.0.0:4723
[Appium] Available drivers:
[Appium]   - uiautomator2@2.0.1 (automationName 'UiAutomator2')
[Appium] Available plugins:
[Appium]   - device-farm@1.0.0-beta.11 (ACTIVE)
[Appium]   - appium-dashboard@1.0.0-beta.10 (ACTIVE)
[device-farm] Device list updated: []
[device-farm] Device list updated: []

[saikrishna321]

We need to improve failing message

[entomber]

@sudharsan-selvaraj It was not set. After setting it I was able see the devices. Thanks!