TM4C123GH6PM: Timer Module is not getting Powered up.

#define GPTMCFG_TIMER0                 (*((volatile unsigned long *)0x40030000))  //GPTMConfiguration
#define GPTMCTL_TIMER0                  (*((volatile unsigned long *)0x4003000c))  //:GPTMControl
#define GPTMTAMR_TIMER0               (*((volatile unsigned long *)0x40030004))  //GPTMTimerAMode
#define RCGC_TIMER                           (*((volatile unsigned long *)0x400FE604)) //16/32-BitGeneral-PurposeTimerRunModeClockGatingControl (RCGCTIMER)
#define GPTMTAILR_TIMER0               (*((volatile unsigned long *)0x40030028)) //:GPTMTimerAIntervalLoad
#define GPTMRIS_TIMER0                   (*((volatile unsigned long *)0x4003001c)) //:GPTMRawInterruptStatus
#define GPTMICR_TIMER0                  (*((volatile unsigned long *)0x40030024)) //:GPTMInterruptClear

void SystemInit(void){  }

void TimerModule_POWER() 
{
   RCGC_TIMER |= 0x01 ; //Giving clock to timer0
}

void timer0_init()
{
	GPTMCTL_TIMER0 |= (0<<0) | (0<< 8) ; //Disabling Timer bits for TimerA and TimerB
	GPTMCFG_TIMER0 = 0x00000000 ;
	GPTMTAMR_TIMER0 |= (0x2<<0) ;//Enabling for periodic mode
	GPTMTAMR_TIMER0 |= (1<<4) ; //for count up
	GPTMTAILR_TIMER0 = 0x0000f42400; //1 sec delay for 16MHz
}

void timer_delay()
{
	GPTMCTL_TIMER0 |= (1<<0) | (1<<8) ; //Enabling TimerA and TimerB
	while(!(GPTMRIS_TIMER0 & 0x01)); //waiting for counter to match the value written in Interval Load register
	GPTMICR_TIMER0  |=  (1<<0) ; 
}

int main()
{
	TimerModule_POWER() ;
	timer0_init() ;
	while(1)
	{
	  GPIODATA_PORTE ^= 0x55 ;
		timer_delay();
	}
}
/* Compilation is done without any error or warning but simulation in Keil is not running. In command window "*** error 65: access violation at 0x400FE604 : no 'read' permission ". What's the problem ?