Ionic browser remove crosswalk throwing error

Hi, I was trying to update crosswalk as I recently updated my ionic/cordova. Any idea what is going on?

 ionic browser remove crosswalk
Removing crosswalk browser
 ✗ Trace
    at (/usr/local/lib/node_modules/ionic/node_modules/ionic-app-lib/lib/project.js:67:13)
    at Object.removeBrowserInstallation (/usr/local/lib/node_modules/ionic/node_modules/ionic-app-lib/lib/browser.js:544:16)
    at Object.removeBrowser (/usr/local/lib/node_modules/ionic/node_modules/ionic-app-lib/lib/browser.js:647:11)
    at (/usr/local/lib/node_modules/ionic/lib/ionic/browser.js:75:17)
    at (/usr/local/lib/node_modules/ionic/lib/cli.js:89:32)
    at Object.<anonymous> (/usr/local/lib/node_modules/ionic/bin/ionic:9:10)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3
 ✗ This should never happen!
 ✗ Unable to save settings file: TypeError: Arguments to path.join must be strings

ionic info:

Your system information:

Cordova CLI: 5.1.1
Ionic Version: 1.0.0-rc.4
Ionic CLI Version: 1.5.4
Ionic App Lib Version: 0.2.1
ios-deploy version: Not installed
ios-sim version: Not installed
OS: Mac OS X Yosemite
Node Version: v0.12.4
Xcode version: Xcode 6.3.2 Build version 6D2105 

problem solved - I just manually removed the platform and re-added it back and looks like cordova now auto pulls crosswalk