Multiboot option is disables

I was trying to install fyde os in my pc.But there is an issue in my pc.
It is booting from usb but i’m unable to multiboot it.
It says the device you are running does not support multiboot installation.

specification of my pc are:-
Intel i3 4th gen processor
1 tb hdd
bios mode:-uefi
32 gb usb drive version 2.0

You need to make sure your hard drive is formatted with GPT, not MBR

hey my problem did not solve bro!
please help me.