NAV Extension: Publish NAV App with Power shell ISE

Hi guys i am trying to create extension for Dynamics NAV 2017 using Delta files approach. I have successfully developed the package. Now when i try to publish the app using

Publish-NAVApp -ServerInstance MDC-Test -Path 'C:\EIE\MDC\x_ZA\Extensions Testing\VAKS.navx' -SkipVerification -Verbose

 I got this error:

I have tried many approaches, searched on google but unfortunately no luck.

Please help i will be thankful to you