I have created a Unity (2018.2.13f1) project, and I want to add a DLL to get information from an external device thru WiFi to plog information in the HoloLens.
I add the .dll file in the assets folder. When I create a script to get info form my costume package and plog it, it recognizes as a reference, and it builds alone.
but when taring to build in unity, it appears the following
I tried with other versions of unity, 2017.2.xx and 2017.4.xx but it appeases the same errors.

