warning MSB8004: Output Directory does not end with a trailing slash. This build instance will add the slash as it is required to allow proper evaluation of the Output Directory.

[Andreas-Schniertshauer]

This can be easily fixed in the Configuration Properties\General\Output Directory by adding a "\" at the end of:
$(Configuration)_$(Platform) (Platform x64)
and
$(Configuration)_x86 (Platform Win32)
both for All Configurations.