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ParrotOS iso in use:
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Application used for flashing the iso:
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Screenshots:
Dude, you have a problem 
Jokes a side, i have this same error one time.
Try this:
in the grub command line type:
ls
You need to go through each, type like(Depends was is show when you type the command)
this comand above will list all devices probabily you will see some returns like:
ls (hd0, 1)/
ls (hd0, 2)/
and until you find
(hd0,1)/boot/grub or (hd0,1)/grub
when find, now you have to set the boots params, like this (With the correct numbers for your case)
Is just a example
set prefix=(hd0,1)/grub
set root=(hd0,1)
insmod linux
insmod normal
normal
boot
now it be able to boot.
when your parrot boot, you need to go in your terminal and type:
sudo update-grub
to fix problems with your grub.
I think it should work. 