Installing Arch on external hard drive

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Hi guys,I'm trying to install Arch on an external hard drive, and making it bootable. However, I can't install grub on it. The grub installation failed during setup, and when I run grub-install, I get:/usr/sbin/grub-setup: warn: This GPT partition label has no BIOS Boot Partition; embedding won't be possible!. /usr/sbin/grub-setup: warn: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged.. /usr/sbin/grub-setup: error: will not proceed with blocklists. ubuntu@ubuntu:/$ sudo gru ()