Error: sparse file not allowed

[Aegon]

Hi everyone.
I am getting an error message
error: sparse file not allowed while booting.
I was making grub timeout and I think I have typed something wrong in the grub file in /etc/default. May I know what is wrong in my grub file?

[filo]

This is a bug/limitation normally due to grub trying to write (set options in the configuration file) on a btrfs file system.
If you cannot boot, boot from a live ISO, restore the grub configuration that you changed and update-grub.

[tbg]

Search:

error: sparse file not allowed

[Aegon]

Thank you.

[Aegon]

Yes sir.