A while ago we talked of a homemade solution to fix the Error -10810 that Finder has when transfers with external disks fail and similar problems, but this one has honestly seemed fantastic and the best thing is that I have found it miraculously.
Today I got the error again and as I was about to open the Terminal I ended up in Spotlight typing to search for files, which has decided to activate the Finder, and after some consultations via Twitter I have verified that it has also worked for other people.
So now you know: if the Finder is left with this error, open Spotlight and click on the file search (Show all).