LAUNCHXL-CC26X2R1: Timer Driver is not working with BLE Stack

Hi,

I'm facing a problem with integrating the timer driver with the BLE stack.

Timer_init();

Timer_Params_init(&params);
params.period = 1000000;
params.periodUnits = Timer_PERIOD_US;
params.timerMode = Timer_CONTINUOUS_CALLBACK;
params.timerCallback = timerCallback;

timer0 = Timer_open(CONFIG_TIMER_0, &params);

if (timer0 == NULL) {
/* Failed to initialized timer */
while (1) {}
}
if (Timer_start(timer0) == Timer_STATUS_ERROR) {
/* Failed to start timer */
while (1) {}
}

when I add this timer code to the BLE Stack main, that timer0 instance is getting NULL and its getting failed to initialize when I try to place it anywhere with BLE STACK.