Not able to load library

I am not able to load library when the header file contains a structure with a member variable an array of Enum.

So basically i have a header file like below

#include "stdio.h"
#include "string.h"

typedef enum {
  tester = 0
} tester_te;

typedef struct {
  tester_te param[4];
} test_ts;

__declspec(dllexport) int initTest (test_ts *inp_s);

and a source file like below:

#include "libfile.h"

void __stdcall _DllMainCRTStartup(void* hinstDLL, unsigned long fdwReason, void* lpReserved)
{
}

int initTest (test_ts *inp_s)
{
  int retValue = 1;
  //ImplJystk_Ini(&ImplJystk_s);
  retValue = 0;
  return retValue;
  }

Now i have created a library using the nmake command and have the .dll & .lib file. Next i try to load the library to matlab like below:

[notfound, warnings] = loadlibrary('libfile', 'libfile.h', 'includepath', 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include'...
, 'includepath', 'C:\Program Files\Microsoft SDKs\Windows\v7.1\Include'...
);

But i recieve an error in matlab saying:

Warning: The data type 'tester_te#4' used by structure test_ts does not exist.  The structure may not be usable. 
> In loadlibrary

Now if i try removing the array in the header file (param[4] to param), the loadlibrary function works without any errors.

Any idea why the first one doesn't work?