[Issue] File system "/boot" is not a FAT EFI System Partition (ESP) file system.

Hello, First of all, big thanks for creating this. I was looking for this and it would perfectly fit my need.

I have a little trouble installing the nix config.

I have installed nixos on a vmware VM with GNOME and I get this error :

File system "/boot" is not a FAT EFI System Partition (ESP) file system.
systemd-boot not installed in ESP.
No default/fallback boot loader installed in ESP.
Traceback (most recent call last):
  File "/nix/store/rgadrgjc12iv6myhc849jxa2h5li9167-systemd-boot/bin/systemd-boot-builder", line 356, in <module>
    main()
  File "/nix/store/rgadrgjc12iv6myhc849jxa2h5li9167-systemd-boot/bin/systemd-boot-builder", line 344, in main
    install_bootloader(args)
  File "/nix/store/rgadrgjc12iv6myhc849jxa2h5li9167-systemd-boot/bin/systemd-boot-builder", line 282, in install_bootloader
    raise Exception("could not find any previously installed systemd-boot")
Exception: could not find any previously installed systemd-boot
warning: error(s) occurred while switching to the new configuration

Should I reinstall nixos from scratch ?