Stange error on the main thread [UE4.26 // Rider Debbuger]

Heyllo guys, i finnish a part of the UE4.26 multiplayer system, i actually have a strange error on the debbug mode , i’ve tried to copy paste the error to googleing answers, but nothing relevant, did you have any requierement or idea about this? the compiling process is well, thank you by advance.