Yes I was able to fix that npm issue, now I tried building the project and faced the same issue again.
[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 Your plugins may be out of
date.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)
Anything else which I need to do please let me know. I can start fresh if you want me to, with the current project in ionic2 to port to ionic3.
Thanks for your support.