Ionic3 build Error - upgrading from ionic2 to ioni3

I did update it too. Still the same.

[WARN] Error occurred during command execution from a CLI plugin (@ionic/cli-plugin-cordova). Your plugins may be out of
       date.
[DEBUG] !!! ERROR ENCOUNTERED !!!
Error: Cannot set property 'fixed' of undefined in undefined at line undefined, col undefined, pos undefined
[DEBUG] Error: Cannot set property 'fixed' of undefined in undefined at line undefined, col undefined, pos undefined
        at BuildError.Error (native)
        at new BuildError
        (D:\app\node_modules\@ionic\app-scripts\dist\util\errors.js:16:28)
        at taskReject
        (D:\app\node_modules\@ionic\app-scripts\dist\worker-process.js:36:22)
        at
        D:\app\node_modules\@ionic\app-scripts\dist\worker-process.js:14:13
        at process._tickCallback (internal/process/next_tick.js:109:7)

PS D:\app> ionic info

global packages:

    @ionic/cli-plugin-proxy : 1.3.1
    @ionic/cli-utils        : 1.4.0
    Cordova CLI             : 6.5.0
    Ionic CLI               : 3.4.0

local packages:

    @ionic/app-scripts              : 1.3.7
    @ionic/cli-plugin-cordova       : 1.4.0
    @ionic/cli-plugin-ionic-angular : 1.3.1
    Cordova Platforms               : android 6.1.2 browser 4.1.0
    Ionic Framework                 : ionic-angular 3.4.0

System:

    Node       : v6.11.0
    OS         : Windows 10
    Xcode      : not installed
    ios-deploy : not installed
    ios-sim    : not installed
    npm        : 3.10.10