usblib causes hardfault on launchpad

Hello i have recently gotten my hands on the launchpad with the tm4c123g

I am now trying to get the launchpad connected to the PC as a mass storage device using the usblib that i downloaded from here:

http://www.ti.com/tool/sw-tm4c

My (Basic) code looks like this:

	// *******************************************************************************************
	//
	// System clock settings
	//
	// *******************************************************************************************

	// Set clock settings to the default of 12.5Mhz, used crystal is 16 Mhz
	uint32_t RCC = (SYSCTL_RCC_XTAL_16MHZ | SYSCTL_RCC_USESYSDIV |  (0x15 << SYSCTL_RCC_SYSDIV_S) );			// Oscillator is a 16MhZ crystal, PLL is used so SYSDIV is needed (defaults to 15 for 12.5Mhz clock)
	SYSCTL_RCC_R = RCC;

	// Override certain register values of the RCC register with the values of the RCC2 register so that we can set the clock speed to 80Mhz
	uint32_t RCC2 = (SYSCTL_RCC2_USERCC2 | SYSCTL_RCC2_DIV400 | (2 << SYSCTL_RCC2_SYSDIV2_S) );
	SYSCTL_RCC2_R = RCC2;

 	//***************************************************************
	//
	// string descriptors for USB
	//
	//***************************************************************

	// language
	const uint8_t langDescriptor[] = {
		    4,									// 1st byte gives descriptor length in bytes.
		    USB_DTYPE_STRING,					// Descriptor type
		    USBShort(USB_LANG_EN_US)			// Language code in 2 bytes (0x0409)
	};

	// Manufacturer
	const uint8_t manuDescriptor[] = {
			( 7 + 1 ) * 2 ,					// 1st byte gives descriptor length in bytes.
			USB_DTYPE_STRING,				// Descriptor type
		    'A', 0, 'r', 0, 't', 0, 'i', 0, 'n', 0, 'i', 0, 's', 0,
	};

	// Product
	const uint8_t productDescriptor[] = {
			( 7 + 1 ) * 2 ,					// 1st byte gives descriptor length in bytes.
			USB_DTYPE_STRING,				// Descriptor type
		    'A', 0, 'r', 0, 't', 0, 'i', 0, 'n', 0, 'i', 0, 's', 0,

	};

	// Serial number
	const uint8_t serialDescriptor[] = {
			( 7 + 1 ) * 2 ,					// 1st byte gives descriptor length in bytes.
			USB_DTYPE_STRING,				// Descriptor type
		    'A', 0, 'r', 0, 't', 0, 'i', 0, 'n', 0, 'i', 0, 's', 0,
	};

	const uint8_t * const stringDescriptors[] = {
			langDescriptor,
			manuDescriptor,
			productDescriptor,
			serialDescriptor,
			productDescriptor,
			productDescriptor
	};

	tUSBDMSCDevice deviceInfo = {
		USB_VID_TI_1CBE,												// UID
		USB_PID_MSC,													// PID
		"Artinis ",														// Vendor
		"PortaProto      ",																		// Product
		"0.01",																					// Revision
		500,																					// Power usage
		USB_CONF_ATTR_SELF_PWR,																	// Power type, bus powered
		stringDescriptors,																		// String descriptors
		6,
		{
			USBDMSCStorageOpen,
			USBDMSCStorageClose,
			USBDMSCStorageRead,
			USBDMSCStorageWrite,
			USBDMSCStorageNumBlocks
		},

		usbEventCallback,																		// USB callback function
		0																						// We dont use DMA
	};
	void* result = USBDMSCInit(0,  &deviceInfo);
        while(1);

Now when running this code as soon as it enters the main i get these errors in the debug window:

And the device enters the FaultISR(void) routine.

When is remove the tUSBDMSCDevice struct initialization and replace it with the following:

	/*tUSBDMSCDevice deviceInfo = {
		USB_VID_TI_1CBE,																		// UID
		USB_PID_MSC,																			// PID
		"Artinis ",																			// Vendor
		"PortaProto      ",																		// Product
		"0.01",																					// Revision
		500,																					// Power usage
		USB_CONF_ATTR_SELF_PWR,																	// Power type, bus powered
		stringDescriptors,																		// String descriptors
		6,
		{
			USBDMSCStorageOpen,
			USBDMSCStorageClose,
			USBDMSCStorageRead,
			USBDMSCStorageWrite,
			USBDMSCStorageNumBlocks
		},

		usbEventCallback,																		// USB callback function
		0																						// We dont use DMA
	};

	void *result = USBDMSCInit(0, &deviceInfo);*/

        void *result = USBDMSCInit(0, NULL);

The code runs fine! (without usb offcourse)

Can anyone help me with debugging this problem? The code compiles without error or warnings.

Thank you,

Sisco