Why ReaR tool fails to create backup with error message "grub2-mkstandalone: error: /usr/lib/grub/x86_64-efi/modinfo.sh doesn't exist." ?

Issue

• ReaR tool fails to create backup with below error:

  GRUB2 modules to load: fat part_gpt xfs
  ERROR: Failed to make bootable EFI image of GRUB2 (error during grub2-mkstandalone of /tmp/rear.xxxx/tmp/mnt/EFI/BOOT/BOOTX64.efi)
  Some latest log messages since the last called script 250_populate_efibootimg.sh:
  mkdir: created directory '/tmp/rear.xxxx/tmp/mnt/EFI/BOOT/fonts'
  mkdir: created directory '/tmp/rear.xxxx/tmp/mnt/EFI/BOOT/locale'
  '/boot/efi/EFI/redhat/grubx64.efi' -> '/tmp/rear.xxxx/tmp/mnt/EFI/BOOT/BOOTX64.efi'
  /usr/share/rear/lib/_input-output-functions.sh: line 476: type: grub-mkstandalone: not found
  /usr/share/rear/lib/_input-output-functions.sh: line 476: type: grub-probe: not found
   grub2-mkstandalone may fail to make a bootable EFI image of GRUB2 (no /usr//grub/x86_64-efi/moddep.lst file)
  GRUB2 modules to load: fat part_gpt xfs
  grub2-mkstandalone: error: /usr/lib/grub/x86_64-efi/modinfo.sh doesn't exist. Please specify --target or --directory.
  Aborting due to an error, check /var/log/rear/rear-xxxx.log for details
  Exiting rear mkbackup (PID 2302293) and its descendant processes ...
  Running exit tasks
  You should also rm -Rf --one-file-system /tmp/rear.xxxx
  Terminated