Need some help, upgrade error.

[jamesbond]

just want to upgrade from 1.6.x to 1.7.x failed

Please guide me solve this error.

Thanks

[baris]

Try running npm i commander --save and try again.

[dragonfruit]

As an addendum, it might help to npm unl commander before installing it. Try Baris' command first, and if no good, then run mine, then Baris' again.

[jamesbond]

@baris problem solved, many thanks!