Unknown error message?

I've gotten this error multiple times, after restarting my computer, and even after using the Buddy Wizard. I don't know what to do about it.

View attachment Hearthbuddy 6796 2015-04-26 13.59.txt

I don't know if that attachment worked for my logs. If not:

2015-04-26 18:59:38,735 [1] INFO Logger (null) - [BotManager] MsBetweenTicks = 15
2015-04-26 18:59:39,097 [1] INFO Logger (null) - Hearthbuddy [0.3.968.150] is up to date!
2015-04-26 18:59:39,339 [1] INFO Logger (null) - T: 5247342734218715107 H: 3196157890
2015-04-26 18:59:39,487 [1] INFO Logger (null) - Hearthbuddy Version: 0.3.968.150
Path: C:\Users\<Username>\Downloads\Hearthbuddy 0.3.968.150\Hearthbuddy.exe

OS Name: Windows 7
OS Edition: Home Premium
OS Service Pack: Service Pack 1
OS Version: 6.1.7601.65536
OS Architecture: x64
.NET Runtime Version: 4.0.30319.17929

2015-04-26 18:59:40,050 [9] ERROR Logger (null) - 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.?(Process ?, ? ?, String& ??)