creating checkboxes in for() loop

I want to create 31 checkboxes in for() loop . My code :

for (int i = 1; i<32; i++)
{
    wchar_t buffer[256];
    std::swprintf(buffer, sizeof(buffer) / sizeof(*buffer), L"1", i);
    g_hPrzycisk = CreateWindowEx(0, "BUTTON", buffer, WS_CHILD | WS_VISIBLE | BS_CHECKBOX, 
        polozenie, 100, 30, 30, hwnd, NULL, hInstance, NULL);
    polozenie = polozenie + 30;
}

ERRORS

C:\Users\Komputer\Desktop\grafik\GrafikOnClick\main.cpp In function 'int WinMain(HINSTANCE, HINSTANCE, LPSTR, int)':

66 120 C:\Users\Komputer\Desktop\grafik\GrafikOnClick\main.cpp [Error] invalid conversion from 'int' to 'LPCSTR {aka const char*}' [-fpermissive]

72 0 C:\Program Files (x86)\Dev-Cpp\MinGW64\x86_64-w64-mingw32\include\windows.h In file included from C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include/windows.h

1 C:\Users\Komputer\Desktop\grafik\GrafikOnClick\main.cpp from main.cpp

1935 26 C:\Program Files (x86)\Dev-Cpp\MinGW64\x86_64-w64-mingw32\include\winuser.h [Note] initializing argument 3 of 'HWND__* CreateWindowExA(DWORD, LPCSTR, LPCSTR, DWORD, int, int, int, int, HWND, HMENU, HINSTANCE, LPVOID)'

28 C:\Users\Komputer\Desktop\grafik\GrafikOnClick\Makefile.win recipe for target 'main.o' failed

What am i doing wrong ??