Crosswalk webviews not added


#1

hello i try to add crosswalk webview , to the project i get from http://reactorapps.io/blog/wordpress-api-ionic-app/#comment-609

but when i use this command = ionic browser add crosswalk , i got this error

Added Cordova Android 4.0
Error occurred while adding plugin: TypeError: Cannot convert undefined or null to object
at Function.keys (native)
at Object.getPluginFromFetchJsonByLocator (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\state.js:744:26)
at Object.savePlugin (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\state.js:673:36)
at C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\cordova.js:266:13
at _fulfilled (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:787:54)
at self.promiseDispatch.done (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:816:30)
at Promise.promise.promiseDispatch (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:749:13)
at C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:509:49
at flush (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:108:17)
at nextTickCallbackWith0Args (node.js:420:9)

An error with adding Crosswalk browser occured TypeError: Cannot convert undefined or null to object

TypeError: Cannot convert undefined or null to object
at Function.keys (native)
at Object.getPluginFromFetchJsonByLocator (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\state.js:744:26)
at Object.savePlugin (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\state.js:673:36)
at C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\cordova.js:266:13
at _fulfilled (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:787:54)
at self.promiseDispatch.done (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:816:30)
at Promise.promise.promiseDispatch (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:749:13)
at C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:509:49
at flush (C:\Users\Pouria\AppData\Roaming\npm\node_modules\ionic\node_modules\q\q.js:108:17)
at nextTickCallbackWith0Args (node.js:420:9)

Cannot convert undefined or null to object (CLI v1.7.15)

Your system information:

Cordova CLI: 4.2.0
Gulp version: CLI version 3.9.1
Gulp local: Local version 3.9.1
Ionic Framework Version: 1.0.0
Ionic CLI Version: 1.7.15
Ionic App Lib Version: 0.7.2
OS:
Node Version: v4.4.5

what can i do ??