12.04 - 'update-grub' syntax error

I've read several previous questions and found no solution. Where I run the update-grub command it gives me this output:

root@Agustin-Ubuntu:/home/agustin# update-grub
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.5.0-45-generic
Found initrd image: /boot/initrd.img-3.5.0-45-generic
Found linux image: /boot/vmlinuz-3.5.0-43-generic
Found initrd image: /boot/initrd.img-3.5.0-43-generic
Found linux image: /boot/vmlinuz-3.5.0-40-generic
Found initrd image: /boot/initrd.img-3.5.0-40-generic
Found linux image: /boot/vmlinuz-3.5.0-39-generic
Found initrd image: /boot/initrd.img-3.5.0-39-generic
Found linux image: /boot/vmlinuz-3.5.0-37-generic
Found initrd image: /boot/initrd.img-3.5.0-37-generic
Found linux image: /boot/vmlinuz-3.5.0-36-generic
Found initrd image: /boot/initrd.img-3.5.0-36-generic
Found linux image: /boot/vmlinuz-3.5.0-34-generic
Found initrd image: /boot/initrd.img-3.5.0-34-generic
Found linux image: /boot/vmlinuz-3.5.0-23-generic
Found initrd image: /boot/initrd.img-3.5.0-23-generic
Found Windows 8 (loader) on /dev/sda1
Found linux image: /boot/vmlinuz-3.5.0-45-generic
Found initrd image: /boot/initrd.img-3.5.0-45-generic
Found linux image: /boot/vmlinuz-3.5.0-43-generic
Found initrd image: /boot/initrd.img-3.5.0-43-generic
Found linux image: /boot/vmlinuz-3.5.0-40-generic
Found initrd image: /boot/initrd.img-3.5.0-40-generic
Found linux image: /boot/vmlinuz-3.5.0-39-generic
Found initrd image: /boot/initrd.img-3.5.0-39-generic
Found linux image: /boot/vmlinuz-3.5.0-37-generic
Found initrd image: /boot/initrd.img-3.5.0-37-generic
Found linux image: /boot/vmlinuz-3.5.0-36-generic
Found initrd image: /boot/initrd.img-3.5.0-36-generic
Found linux image: /boot/vmlinuz-3.5.0-34-generic
Found initrd image: /boot/initrd.img-3.5.0-34-generic
Found linux image: /boot/vmlinuz-3.5.0-23-generic
Found initrd image: /boot/initrd.img-3.5.0-23-generic
Found memtest86+ image: /boot/memtest86+.bin
Found linux image: /boot/vmlinuz-3.5.0-45-generic
Found initrd image: /boot/initrd.img-3.5.0-45-generic
Found linux image: /boot/vmlinuz-3.5.0-43-generic
Found initrd image: /boot/initrd.img-3.5.0-43-generic
Found linux image: /boot/vmlinuz-3.5.0-40-generic
Found initrd image: /boot/initrd.img-3.5.0-40-generic
Found linux image: /boot/vmlinuz-3.5.0-39-generic
Found initrd image: /boot/initrd.img-3.5.0-39-generic
Found linux image: /boot/vmlinuz-3.5.0-37-generic
Found initrd image: /boot/initrd.img-3.5.0-37-generic
Found linux image: /boot/vmlinuz-3.5.0-36-generic
Found initrd image: /boot/initrd.img-3.5.0-36-generic
Found linux image: /boot/vmlinuz-3.5.0-34-generic
Found initrd image: /boot/initrd.img-3.5.0-34-generic
Found linux image: /boot/vmlinuz-3.5.0-23-generic
Found initrd image: /boot/initrd.img-3.5.0-23-generic
Found Windows 8 (loader) on /dev/sda1
error: syntax error.
error: Incorrect command.
error: syntax error.
error: Incorrect command.
error: syntax error.
error: line no: 165
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

The problem here is that the Grub Customizer is not being updated after the update to the 3.5.0-45-generic version, so the entries in the menu are all messed up and i cant get them in the order I want because the Grub Customizer has no effect, it is displaying the proper new entries but it doesn't modify the menu when I boot.

This is my /etc/default/grub file:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'
GRUB_DEFAULT="1"
#GRUB_HIDDEN_TIMEOUT="0" GRUB_HIDDEN_TIMEOUT_QUIET="true" GRUB_TIMEOUT="10" GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null ||
echo Debian`" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE="640x480"
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_SAVEDEFAULT="false"