No licenses.licx file
In order to create the licenses.licx file automatically, right-click on the "ReportService.svc.cs" item in the Solution Explorer and then click on "View Designer" in the appeared pop-up menu.
The licenses.licx file will be created. It contains a list of the licensed components. In this case it contains only one line:
PerpetuumSoft.ReportingServices.Viewer.Server.ReportServiceRemote, PerpetuumSoft.ReportingServices.Viewer.Server, Version=18.104.22.168, Culture=neutral, PublicKeyToken=8a6ae0a3e67829b5
Manual Creation of .licx File.