undefined reference to `z_nrf_grtc_wakeup_prepare' , in nrf52833, system_off Sample code (v2.9.0).

I want to implement deep sleep (wake up using RTC at a particular time interval), and determine the current consumption in nrf52833 dk. So I used the sample code first. When i try to build the code, I am getting the error : 

undefined reference to `z_nrf_grtc_wakeup_prepare'.

In my prj.conf file, I defined  : 

CONFIG_GRTC_WAKEUP_ENABLE=y
 
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