Blutility error message

Hi,

I’m not sure what I’ve done but I am now receiving an error message which I don’t know how to solve.
My previous actions before saving.
I deleted a content folder which I’m sure had nothing in it.
I moved a material shader from one folder to another.

Any help is appreciated!

Recreate the node. It should fix it.

The thing is, I dont know what it looked like before.