Return function int64 C++ to a C# project

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Hi, i write a dll that is injected on game and return my localplayer and listArrayplayer on server. Ok work fine
code dll project:

__int64 RerturnLocalPlayer() {

    __int64 player = GetLocalPlayer_EX();// __Int64 GetLocalPlayer_EX is function that return my player
    return player;
}

in my main.h:

extern "C" {

	__declspec(dllexport) __int64 RerturnLocalPlayer();
}

in my C# code:

[System.Runtime.InteropServices.DllImportAttribute("my.dll", EntryPoint = "RerturnLocalPlayer",
        CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
        public static extern Int64 RerturnLocalPlayer();

// and try return:

 Int64 localp = NativeMemory.Read<Int64> (RerturnLocalPlayer());

 Console.WriteLine("LocalPlayer " + localp.ToString("X"));

the problem is when i run my c# application my console open and after 3 seconds close and sometimes get error: "

"Attempt to read or write to protected memory. Usually, this is an indication that another memory is damaged.".

"

What I have tried:

__int64 RerturnLocalPlayer() {

		__int64 player = GetLocalPlayer_EX();// __Int64 GetLocalPlayer_EX is function that return my player
		return player;
	}

in my main.h:

extern "C" {

	__declspec(dllexport) __int64 RerturnLocalPlayer();

}

        [System.Runtime.InteropServices.DllImportAttribute("my.dll", EntryPoint = "RerturnLocalPlayer",
        CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
        public static extern Int64 RerturnLocalPlayer();

// and try return:

 Int64 localp = NativeMemory.Read<Int64> (RerturnLocalPlayer());

 Console.WriteLine("LocalPlayer " + localp.ToString("X"));