RM48L952: No system tick counter

Hello,

I have an RM48 HDK, Iam programming in Keil uVision5 RTX-RTOS, and I am using a Seeger JLink programmer. I have written the simple example program below. After calls to os_dly_wait() in both tasks , the console reports "* JLink Info: Memory access: CPU temp. halted: https://wiki.segger.com/Memory_accesses#Stop_mode," and the program stops.

#include <RTL.h>                      /* RTX kernel functions & defines      */
#include "rti.h"
#include <stdint.h>

volatile U32 g_os_err_code;

/* id1, id2 will contain task identifications at run-time */
OS_TID id1, id2;

int counter1;
int counter2;

/* Forward reference */
__task void task1(void);
__task void task2(void);


/* Used for debugging */
uint32_t sys_time;

__task void task1(void)
{
	/* Obtain own system task identification number */
	id1 = os_tsk_self ();
	/* Assign system identification number of task 1 to id1 */
	id2 = os_tsk_create(task2, 1);
	
	while(1)
	{
		sys_time = os_time_get();
		counter1++;
		/* Indicate to task2 completion of do-this */
		os_evt_set (0x0004, id2);
		/* Wait for completion of do-that (0xffff means no time-out)*/
		os_evt_wait_or (0x0004, 0xffff);
		/* Wait now for 50 ms */
		os_dly_wait((uint16_t)5);		
		sys_time = os_time_get();
	}
}

__task void task2(void)
{
	while(1)
	{
		sys_time = os_time_get();
		counter2++;		
		/* Wait for completion of do-this (0xffff means no time-out) */
		os_evt_wait_or (0x0004, 0xffff); /* do-that */
		/* Pause for 20 ms until signaling event to task1 */
		os_dly_wait((uint16_t)2);
		/* Indicate to task1 completion of do-that */
		os_evt_set (0x0004, id1);		
	}
}

int main(void)
{
	// Enable interrrupts.
	__enable_fiq();
	__enable_irq();
	
	os_sys_init(task1);
}