Custom USB with TIVA C LaunchPad

I am trying to implement a custom USB device using TIVA C launchpad.

My requirement is two int endpoint (in & out) and two bulk endpoints(in & out). The config code is attached. The device fails to enumerate itself.
I find few problems to start with:

tDeviceInfo g_sDeviceInfo =
{
    //
    // Device event handler callbacks.
    //
    {
        0,                      // GetDescriptor
        0,                      // RequestHandler
        0,                      // InterfaceChange
        HandleConfigChange,     // ConfigChange
        0,                      // DataReceived
        0,                      // DataSentCallback
        HandleReset,            // ResetHandler
        0,                      // SuspendHandler
        0,                      // ResumeHandler
        HandleDisconnect,       // DisconnectHandler
        HandleEndpoints         // EndpointHandler
    },
    g_pDeviceDescriptor,
    g_pConfigDescriptors,
    g_pStringDescriptors,
    (unsigned long)(sizeof(g_pStringDescriptors) /
                    sizeof (unsigned char const *)),
};

On compilation I receive #1238-D excess initializers are ignored, with the callback structure.

Besides, in Tiva C, the USB device init requires tDCDInstance :

void USBDCDInit(uint32_t ui32Index, tDeviceInfo *psDevice, void *pvDCDCBData);

How can I initialize tDCDInstance to get pvDCDCBData?

Please help. Thanks in advance.

Deep.