Cannot add platform using Cordova CLI 7.0.0

I updated my Cordova CLI from 6.5 to 7.0.0 using the command npm update -g cordova. I created a project( cordova create myApp com.myCompany.myApp myApp ). When I try to add Android to the project ( cordova platform add android ), i am getting the below error.

Error: Failed to fetch platform cordova-android@~6.2.2
Probably this is either a connection problem, or platform spec is incorrect.
Check your connection and platform name/version/URL.
Error: cmd: Command failed with exit code 1 Error output:
'C:\windows\system32\npm' is not recognized as an internal or external command,
operable program or batch file.

I also tried adding android with specific version which is available with CLI in my machine ( cordova platform add android@5.1.1 ) but results the same.

Is there any special way to add platform tot he project with Cordova 7.0.0. ?

via Joseph