cordova安装camera出错

cordova安装camera出错：

PS D:\vux-web\ilhapp> cordova plugin add cordova-plugin-camera
Installing "cordova-plugin-camera" for android
Subproject Path: CordovaLib
Subproject Path: app
Installing "cordova-plugin-camera" for android-21
Unable to load PlatformApi from platform. Error: Cannot find module 'D:\vux-web\ilhapp\platforms\android-21\cordova\Api.js'
Require stack:
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\cordova\util.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\platforms\platforms.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\plugman.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\cordova-lib.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\src\help.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\src\cli.js
- C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\bin\cordova
Failed to install 'cordova-plugin-camera': Error [ERR_UNHANDLED_ERROR]: Unhandled error. ('The platform "android-21" does not appear to be a valid cordova platform. It is missing API.js. android-21 not supported.')
    at CordovaEventEmitter.emit (events.js:199:17)
    at CordovaEventEmitter.emit (C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-common\src\events.js:69:22)
    at Object.getPlatformApiFunction (C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\cordova\util.js:384:20)
    at Object.getPlatformApi (C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\platforms\platforms.js:55:32)
    at handleInstall (C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js:580:29)
    at C:\Users\gaodk\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js:349:28
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
Unhandled error. ('The platform "android-21" does not appear to be a valid cordova platform. It is missing API.js. android-21 not supported.')

出现这个问题的原因可能是phonegap模板生成器存在问题它会安装旧的或损坏的浏览器版本，而解决的办法就是删除浏览器平台并重新添加

解决办法：

删除浏览器平台

1，phonegap platform rm browser

重新添加浏览器平台

2，phonegap platform add browser