Street Racing Issue (Translated from german)

[07:00:48] [ERROR] Caught fatal unhandled exception:
System.TypeLoadException: The type "NativeUI.BigMessageThread" in the assembly "NativeUI, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" could not be loaded.
   bei Street_Races.Util.Countdown()
   bei Street_Races.StreetRaces.OnTick(Object sender, EventArgs e)
   bei GTA.Script.raise_Tick(Object value0, EventArgs value1)
   bei GTA.Script.MainLoop()