Help! Problem Red Alert 2 Yuri's Revenge CnCnet

[Rocker47]

Hello. There was a problem when starting the game RA2/YR via CnCnet 5. When the network game starts, it writes an error: "If you enabled no-CD make sure the files "multimd.mix" and "mapsmd3.mix" are in the game install folder, they're usually located on the CD". But I already have these files in the game. Build the game RA2/YR from RA2.IN. What should I do?