I have the same problem. Node editor is correct installed
and the command in the shortcuts is copied from a thread here.

moi.ui.createDialog( 'nodeeditor/index.html', 'resizeable,defaultWidth:680,defaultHeight:420', moi.ui.mainWindow )

The nodeeditor folder is in the ui-folder and inside is the index.html.

I can't solve this issue and for me its's to abstract (copy this) to follow the instructions to install scripts or plugins.
I thik, it's to complicated to install plugins in moi for no programmers like me :D