Kernel panic-not syncing: VFS: unable to mount root fs on unknown- block(179,2)

[Mohamad-84]

Dears, today and suddenly my Raspberry Pi could no longer boot up, and on the screen there was a long text indicating:
Kernel panic-not syncing: VFS: unable to mount root fs on unknown- block(179,2)

I tried to troubleshoot the problem, but that didn't work either, and honestly my experience is limited. :(
Could anyone help please?
cmdline.txt is:
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=PARTUUID=47fb704e-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles

Thank you in advance!