EK-TM4C123GXL: sContext unresolved for only 1 function with grlib

I've been trying to pass readings to my screen from a function and I keep running into the problem that sContext is unresolved.  If I remove the update function then everything is fine and screens work as they should with Lab 10 of the TIVA Workshop.  I'm using Lab 10 as the base to build a set of screens.

I tried to redefine the context variable in the function which allows the linker to assembly the object file.  But then when I go to run the program I get a FaultISR.  I didn't think it was the right way to do this anyways but I had to try something.

Here's my function and header so far:

#include <stdint.h>
#include <stdbool.h>
#include "grlib/grlib.h"
#include "grlib/widget.h"
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"
#include "driverlib/debug.h"
#include "driverlib/adc.h"
#include "driverlib/fpu.h"
#include "driverlib/rom.h"
#include "Kentec320x240x16_ssd2119_8bit.h"
#include "touch.h"


extern void updateScreen(void);
extern tContext sContext;

#include "updateScreen.h"



void updateScreen(void){

    TimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT);

    GrContextForegroundSet(&sContext, ClrBlue);
    GrStringDraw(&sContext, "test", -1, 150, 2, 0);
    //    GrStringDraw(&sContext, sample_buf, 5, 150, 40, 0);

}

Any help you could give me with using sContext API functions in subfunctions would be appreciated.

Thanks