Library compilation error
I have the same problem since version 1.8.10. 

With a good running sketch I don't get any message "Multiple libraries were found" (and no warnings also)

But with every small compiler error I get a whole list of "Multiple libraries were found"

My custom libraries are in a sketchbook location
D:\DATA BACKUPPED\Documenten Albert\Arduino\Sketchbook-and-user-libraries