NuGet Warning NU5109

The file at 'tools/.' uses the symbol for empty directory '.', but it is present in a directory that contains other files. Please remove this file from directories that contain other files.

Issue

A file with file name _._ was detected in a folder that contains other files.

Solution

The file name '.' is used as a symbol of empty directories. Any file with that file name should be present in an empty directory. Please remove this file from directories that contain other files.