CentOS 7 stuck at grub prompt after upgrading Kernel

I tried to upgrade the Kernel using YUM and when I ran [root@AFIBAMBOO bin]# grub2-mkconfig -o /boot/grub2/grub.cfg No path or device is specified. Usage: grub2-probe [OPTION...] [OPTION]... [PATH|DEVICE] Try 'grub2-probe --help' or 'grub2-probe --usage' for more information. No path or device is specified. Usage: grub2-probe [OPTION...] [OPTION]... [PATH|DEVICE] Try 'grub2-probe --help' or 'grub2-probe --usage' for more information. No path or device is specified. Usage: grub2-probe [OPTION...] [OPTION]... [PATH|DEVICE] Try 'grub2-probe --help' or 'grub2-probe --usage' for more information.