HPE DL380 G9 pre-boot critical error Clock not set

Hi ! There is a critical error in one of our DL380 G9 servers !
when we power on that server, it didnt boot and all front leds started to blink ! when i push UID button, pre-boot health summary displayed in monitor ! I attached that picture !
Critical Error = Clock Not Set
So what should we do to fix this problem ?

Regards