Conflicting Nix Home Manager packages

I've been using Nix Home Manager to manage packages on Mac OS, and hit a new problem adding ripgrep to home.packages - this has previously been fine. I don't really know what the error means or how to correctly fix it - help appreciated!

$ home-manager switch
/nix/store/g9wiv0f7nhwqjqdn1cwi317zw9anknfs-home-manager-generation
Starting Home Manager activation
Activating checkFilesChanged
Activating checkLaunchAgents
Activating checkLinkTargets
Activating writeBoundary
Activating copyFonts
Activating installPackages
error: files '/nix/store/qdylbr09f0zjc44zkxjrf4ilzkpj05gl-home-manager-path/bin/man' and '/nix/store/2jahwbgdzz4cabfp0w1009ysdpb47ycb-home-manager-path/bin/man' have the same priority 5; use 'nix-env --set-flag priority NUMBER INSTALLED_PKGNAME' or type 'nix profile install --help' if using 'nix profile' to find out howto change the priority of one of the conflicting packages (0 being the highest priority)

Oops, Nix failed to install your new Home Manager profile!

Perhaps there is a conflict with a package that was installed using
"nix profile install"? Try running

    nix profile list

and if there is a conflicting package you can remove it with

    nix profile remove {number | store path}

Then try activating your Home Manager configuration again.

And

$ nix profile list
0 - - /nix/store/2jahwbgdzz4cabfp0w1009ysdpb47ycb-home-manager-path
1 github:nix-community/comma#packages.aarch64-darwin.default github:nix-community/comma/691120d169189f3a9cb29b1c72bcd521ac372b2b#packages.aarch64-darwin.default /nix/store/la30szfb9m9bq7y8nwc2dmxjlq361rqm-comma-1.2.3
2 - - /nix/store/2jahwbgdzz4cabfp0w1009ysdpb47ycb-home-manager-path

I have recently installed comma , which sounds like it could plausibly be part of the issue?