Terraria wont start

When i open Terraria, i get an error message:
System.DIINotFoundException: Unable to load DLL 'CSteamworks':Cannot find specified module.
at
Steamworks.NativeMethods.SteamAPI_RestartAppIfNecessary(Appid_tunOwnAppID)
at Terraria.Social.Steam.CoreSocialModule.Initialized()
at Terraria.Social.SocialAPI.Initialize(Nullable`1 mode)
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs)

Pls help i really want to play