Bought 3 Day Code - ERROR please help!

Hello so i just bought a 3 day code and got the following error:

System.MissingMethodException: Method not found: 'Void System.Runtime.InteropServices.Marshal.StructureToPtr(UInt32, IntPtr, Boolean)'.
at GreyMagic.MemoryBase.WriteMarshaled[T](IntPtr addr, T value, Boolean& wasRead)
at GreyMagic.MemoryBase.Write[T](IntPtr addr, T value)
at GreyMagic.Executor.set_FrameDropWaitTime(UInt32 value)
at GreyMagic.Executor.InitializeDetour()
at GreyMagic.Executor..ctor(ExternalProcessMemory memory, ExecutorInitParams initParams)
at GreyMagic.ExternalProcessMemory.Init(ExternalProcessMemoryInitParams initParams)
at GreyMagic.ExternalProcessMemory.Init(Process p, Boolean startupExecutor, Boolean dx9, Boolean startupRasm, IntPtr hookFunc, Boolean defaultCacheValue, Int32 copyBytes, Boolean veh, Boolean iatHook)
at GreyMagic.ExternalProcessMemory..ctor(Process p, Boolean startupExecutor, Boolean dx9, Boolean startupRasm)
at Triton.Game.TritonHs. š(Process ‰, † †, String& Žš)

Regards

James