SetAltInterface() error 31

Hello,
I have problem with USB on SAM3S2C (user board) configured as USB device
Vendor Class (it is my first project with USB). I can't set alternate
setting to 1 of the interface 0. Device is opened successfully, but I get
error in function  SetAltInterface() - 31 (0x1F)  (ERROR_GEN_FAILURE  A
device attached to the system is not functioning).

I'm using libusbK 3.0.7.0., Windows 7.
USB: 2.0, Full speed

What am I doing wrong?

Thank you,
Milan

DWORD __cdecl main(int argc, char* argv[])
{
...
Examples_GetTestDevice(...);
LibK_LoadDriverAPI(...);
Usb.Init(...);
ConfigureDevice(...); // Fail
...
}

BOOL ConfigureDevice(KUSB_HANDLE UsbHandle, PKUSB_DRIVER_API DriverAPI)
{
DWORD errorCode = ERROR_SUCCESS;

if (!DriverAPI->SetConfiguration(UsbHandle, 1))
{
errorCode = GetLastError();
printf("UsbK_SelectInterface failed. ErrorCode: %d, %08Xh\n", errorCode,
errorCode);
return FALSE;
}

if (!DriverAPI->ClaimInterface(UsbHandle, 0, FALSE))
{
errorCode = GetLastError();
printf("UsbK_ClaimInterface failed. ErrorCode: %d, %08Xh\n", errorCode,
errorCode);
return FALSE;
}

 if (!DriverAPI->SetAltInterface(UsbHandle, 0, FALSE, 1)) // Get error 31
{
errorCode = GetLastError();
printf("UsbK_SetCurrentAlternateSetting failed. ErrorCode: %d, %08Xh\n",
errorCode, errorCode);
return FALSE;
}
return TRUE;
}

Device configurations (from enum_descriptors example for libusbK):

[Config Descriptor]
bLength :9
bDescriptorType :0x02
wTotalLength :55
bNumInterfaces :1
bConfigurationValue :1
iConfiguration :0
bmAttributes :0x80
MaxPower :250

[Interface Descriptor]
bLength :9
bDescriptorType :0x04
bInterfaceNumber :0
bAlternateSetting :0
bNumEndpoints :0
bInterfaceClass :0xFF
bInterfaceSubClass :0xFF
bInterfaceProtocol :0xFF
iInterface :0

[Interface Descriptor]
bLength :9
bDescriptorType :0x04
bInterfaceNumber :0
bAlternateSetting :1
bNumEndpoints :4
bInterfaceClass :0xFF
bInterfaceSubClass :0xFF
bInterfaceProtocol :0xFF
iInterface :0

[Endpoint Descriptor]
bLength :7
bDescriptorType :0x05
bEndpointAddress :0x83
bmAttributes :0x03
wMaxPacketSize :64
bInterval :1

[Endpoint Descriptor]
bLength :7
bDescriptorType :0x05
bEndpointAddress :0x06
bmAttributes :0x03
wMaxPacketSize :64
bInterval :1

[Endpoint Descriptor]
bLength :7
bDescriptorType :0x05
bEndpointAddress :0x81
bmAttributes :0x02
wMaxPacketSize :64
bInterval :0

[Endpoint Descriptor]
bLength :7
bDescriptorType :0x05
bEndpointAddress :0x02
bmAttributes :0x02
wMaxPacketSize :64
  bInterval :0

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