The option `services.desktopManager' does not exist [SOLVED]

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Hello! I have just stumbled upon a very weird issue where services.desktopManager and services.displayManager don’t seem to exist anymore. The issue started (as far as I am aware) when I tried to update the nix channels from 24.05 to 24.11. I rebuilt the system and got these errors. I don’t think I changed anything in the config file to cause this and I even tried to rollback to an earlier version of the file, I rebuilt it again and got the same issue even on an older known to be working (I think) file. I also tried going back to 24.05 and it was of no help. Any advice would be appreciated.

This is the error I get:

error:
       … while evaluating the attribute 'config.system.build.toplevel'

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:320:9:

          319|         options = checked options;
          320|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          321|         _module = checked (config._module);

       … while calling the 'seq' builtin

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:320:18:

          319|         options = checked options;
          320|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          321|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: The option `services.desktopManager' does not exist. Definition values:
       - In `/etc/nixos/configuration.nix':
           {
             plasma6 = {
               enable = true;
             };
           }

Thanks in advance!

EDIT: Turns out I accidentally switched to the 23.11 channel instead of 24.11, after I did that the issue was resolved.