Keep getting error message when saving

Every time I try to save a background image, I keep getting the message below. I also did a fresh install of Ubuntu 16.04 64 bit, and still getting the same message. I am able to set background images on my other computers. What could be causing this error?

failed running 'grub-mkconfig -o "/boot/grub/grub.cfg"' output:
Generating grub configuration file ...
using custom appearance settings
Found background image: /home/coppy/Mom & Dad 1955.png
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sda1
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 109
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.
done