I'm new to this forum and to Blender as well. I'm starting to learn a little bit of Blender 2.8 and just tried to use the Node Wrangler add-on. I when try to click the 'Add Principled Setup' option on the Shader Editor I just have a `No Folder Selected' response. What I am doing wrong? Thanks in advance.
I might be wrong but I thinks it's as simple as you first have to click on the "principled BSDF" otherwise blender doesn't know where you want to add the principled set-up.
So just click on the node to make sure it's highlighted and try again!