Loading a .dll written in c++

Hi,

I have written a .dll in Visual Studio in c++ and wrapped in extern C-functions. Now I tried to load the .dll with the header files in matlab

addpath('D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\FF_dll')

if not(libisloaded('FF_dll.dll'))
    loadlibrary('D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\x64\Release\FF_dll\FF_dll.dll', 'D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\FF_dll\FF_dll.h') 
end

and get the following errors:

Error using loadlibrary
There was an error loading the library "D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\x64\Release\FF_dll\FF_dll.dll"
Das angegebene Modul wurde nicht gefunden. (EN: The specified module was not found.)



Error in test (line 4)
    loadlibrary('D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\x64\Release\FF_dll\FF_dll.dll', 'D:\Philipp\repos\uwp_force_feedback\FF_UWP_dll\FF_dll\FF_dll\FF_dll.h')

Caused by:
    Error using loaddefinedlibrary
    Das angegebene Modul wurde nicht gefunden. (EN: The specified module was not found.)

For reference here is my header file:

#pragma once

#ifdef FF_UWP_EXPORTS
#define FF_UWP_API __declspec(dllexport)
#else
#define FF_UWP_API __declspec(dllimport)
#endif

#ifdef __cplusplus
extern "C" {
	typedef struct wheelreadings {
		double throttle;
		double brake;
		double clutch;
		double angle;
		double mastergain;
	} WheelReadings;

	// Initialize the racing wheel
	FF_UWP_API void initRacingWheel();
	FF_UWP_API int initForceFeedback(int samplingTime);
	FF_UWP_API void readWheelStatus(WheelReadings* wheelValues);
	FF_UWP_API void FF_minus(double gain);
}
#else
	typedef struct wheelreadings {
		double throttle;
		double brake;
		double clutch;
		double angle;
		double mastergain;
	} WheelReadings;

	// Initialize the racing wheel
	FF_UWP_API void initRacingWheel();
	FF_UWP_API int initForceFeedback(int samplingTime);
	FF_UWP_API void readWheelStatus(WheelReadings* wheelValues);
	FF_UWP_API void FF_minus(double gain);
#endif

Any ideas why it won't load?