PIC18F87J50 WinUSB bulk transfer from device to host fails!!!

[giz.mo]

Hello all,

I have a PIC18F87J50 PIM communicating with a PC running Windows 8.1. I just want to send data with bulk endpoints.
I have written the code for device in C based on the demo project "Device - WinUSB - Generic Dempo Project".
I have written the application in VS2013 professional (C++) based on the tutorial below:


The device is recognized and configured by the PC and the application gets all the descriptors and pipe information without any problem. Everything works fine until the WinUSB_ReadPipe request is sent. As a response to that request I get the Last Error Code:31 which means "A device attached to the system is not functioning." I have no idea what is wrong.

Here is my configuration descriptors:

/* Configuration 1 Descriptor */
ROM BYTE configDescriptor1[]={
    /* Configuration Descriptor */
    0x09, //sizeof(USB_CFG_DSC), // Size of this descriptor in bytes
    0x02, // CONFIGURATION descriptor type
    0x19,0x00, // Total length of data for this cfg
    1, // Number of interfaces in this cfg
    1, // Index value of this configuration
    0, // Configuration string index
    _DEFAULT | _SELF, // Attributes, see usb_device.h
    50, // Max power consumption (2X mA)

    /* Interface Descriptor */
    0x09, //sizeof(USB_INTF_DSC), // Size of this descriptor in bytes
    0x04, // INTERFACE descriptor type
    0, // Interface Number
    0, // Alternate Setting Number
    1, // Number of endpoints in this intf
    0xFF, // Class code
    0xFF, // Subclass code
    0xFF, // Protocol code
    0, // Interface string index
    
    0x07, /*sizeof(USB_EP_DSC)*/
    0x05, //Endpoint Descriptor
    _EP01_IN, //EndpointAddress
    _BULK, //Attributes
    USBGEN_EP_SIZE,0x00, //size
    1 //Interval
};

The code to send the data:

void myApp(void)
{
 if(blinkStatusValid)
    {
        BlinkUSBStatus();
    }
 
 if((USBDeviceState < CONFIGURED_STATE)||(USBSuspendControl==1)) return;

 if(!USBHandleBusy(USBGenericInHandle)) 

 {
  INPacket[0] = 0xab;

  USBGenericInHandle = USBGenWrite(USBGEN_EP_NUM,(BYTE*)&INPacket[0],64);

 } 
}

The function to initialize the endpoints;

void USBCBInitEP(void)
{
    //Enable the appplication data endpoint(s)
    USBEnableEndpoint(USBGEN_EP_NUM,USB_OUT_ENABLED|USB_IN_ENABLED|USB_HANDSHAKE_ENABLED|USB_DISALLOW_SETUP);

}

WINDOWS APPLICATION

BOOL ReadFromBulkEndpoint(WINUSB_INTERFACE_HANDLE hDeviceHandle, UCHAR* pID)
{
 if (hDeviceHandle == INVALID_HANDLE_VALUE)
 {
  return FALSE;
 }

 BOOL bResult = TRUE;

 UCHAR* szBuffer = (UCHAR*)LocalAlloc(LPTR, 64);

 ULONG cbRead = 0;

 bResult = WinUsb_ReadPipe(hDeviceHandle, *pID, szBuffer, 64, &cbRead, 0);
 
 if (FALSE == bResult ) {

  printf(_T("Error among LastError %d \n"),
   FALSE == bResult ? GetLastError() : 0);
 }

 printf("Read from pipe %04X: %s \nActual data read: %d.\n", *pID, szBuffer, cbRead);


 LocalFree(szBuffer);
 return bResult;

}

I keep getting the error code 31 ffrom this function. What is wrong with these codes? Any help would be appreciated very much!

Thank you!