Is there a reason that you are using Plesk? Tools like that generally make support and management vastly more difficult. Something like a NodeBB install is so easy, but Plesk can make it so hard for no reason.
It is dangerous to run nodebb this way. Do so at your own risk.
I'm not sure exactly what is causing that npm error, but it's not a NodeBB bug. I suggest you look it up yourself.
I did Restart of my Nodebb Forum and now don't work the Panel of Admin.
I have this Plugins : http://i.gyazo.com/1b437a3267beaf5db0385e572cd6239c.png
O.S : Windows Server 2012
Nodebb Version : 0.6.0
Can you please share the server-side error? This client-side error is not something we can use, unfortunately.
@Bri it seems to be related to 2 critical settings for uploads, avatars have there own maximum size while profile headers use the maximum size for any upload that should go in posts