Problem with new tModLoader.

Hi. Can someone help me? When I try to start mods terraria, I get this message:

System.DllNotFoundException: Unable to load DLL 'CSteamworks': Can't find the specified module. (Exception from HRESULT: 0x8007007E)
at Steamworks.NativeMethods.SteamAPI_RestartAppIfNecessary(AppId_t unOwnAppID)
at Terraria.Social.Steam.CoreSocialModule.Initialize()
at Terraria.Social.SocialAPI.Initialize(Nullable`1 mode)
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs)