Plugin not applied to iOS

I’m using cordova-plugin-device 2.0.1 “Device” plugin to get unique id of device.

but having problem using it in iOS
xcode log said below.

2018-03-11 21:00:43.036326+0900 ionic_ruliweb[3683:2260203] CDVPlugin class CDVDevice (pluginName: Device) does not exist.
2018-03-11 21:00:43.036407+0900 ionic_ruliweb[3683:2260203] ERROR: Plugin ‘Device’ not found, or is not a CDVPlugin. Check your plugin mapping in config.xml.
2018-03-11 21:00:43.036463+0900 ionic_ruliweb[3683:2260203] -[CDVCommandQueue executePending] [Line 142] FAILED pluginJSON = [“Device282422682”,“Device”,“getDeviceInfo”,[]]

why is it?

ionic info is below

li packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.19.1
ionic (Ionic CLI) : 3.19.1

global packages:

cordova (Cordova CLI) : 7.0.1

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 6.4.0 ios 4.4.0
Ionic Framework    : ionic-angular 3.9.2

System:

ios-deploy : 1.9.2
Node       : v8.4.0
npm        : 5.6.0
OS         : macOS High Sierra
Xcode      : Xcode 9.2 Build version 9C40b

Environment Variables:

ANDROID_HOME : not set

Misc:

backend : legacy