Node.js/Windows error: ENOENT, stat 'C:\Users\RT\AppData\Roaming\npm'
Manually creating a folder named 'npm' in the displayed path fixed the problem.
More information can be found on Troubleshooting page
I ran into the same problem while installing a package via npm.
After creating the npm folder manually in C:\Users\UserName\AppData\Roaming\ that particular error was gone, but it gave similar multiple errors as it tried to create additional directories in the npm folder and failed. The issue was resolved after running the command prompt as an administrator.
This can also be fixed by installing a node package manually.
npm install npm -gThe process of doing that will setup all the required directories.