Need some help, upgrade error.
just want to upgrade from 1.6.x to 1.7.x failed
Please guide me solve this error.
npm i commander --saveand try again.
As an addendum, it might help to
npm unl commanderbefore installing it. Try Baris' command first, and if no good, then run mine, then Baris' again.
@baris problem solved, many thanks!