Failed to start Application launched by gnome-session-binary

What applications are these that it is referring to?

Sep 24 13:00:14 xmg systemd[823]: Started Application launched by gnome-session-binary.
Sep 24 13:00:14 xmg systemd[823]: app-gnome-gnome\x2dkeyring\x2dssh-887.scope: Couldn't move process 887 to requested cgroup '/user.slice/user-1000.slice/user@1000.service/app.slice/app-gnome-gnome\x2dkeyring\x2dssh-887.scope': No such process
Sep 24 13:00:14 xmg systemd[823]: app-gnome-gnome\x2dkeyring\x2dssh-887.scope: Failed to add PIDs to scope's control group: No such process
Sep 24 13:00:14 xmg systemd[823]: app-gnome-gnome\x2dkeyring\x2dssh-887.scope: Failed with result 'resources'.
Sep 24 13:00:14 xmg systemd[823]: Failed to start Application launched by gnome-session-binary.
Sep 24 13:00:16 xmg systemd[823]: app-gnome-snap\x2duserd\x2dautostart-1159.scope: Couldn't move process 1159 to requested cgroup '/user.slice/user-1000.slice/user@1000.service/app.slice/app-gnome-snap\x2duserd\x2dautostart-1159.scope': No such process
Sep 24 13:00:16 xmg systemd[823]: app-gnome-snap\x2duserd\x2dautostart-1159.scope: Failed to add PIDs to scope's control group: No such process
Sep 24 13:00:16 xmg systemd[823]: app-gnome-snap\x2duserd\x2dautostart-1159.scope: Failed with result 'resources'.
Sep 24 13:00:16 xmg systemd[823]: Failed to start Application launched by gnome-session-binary.
Sep 24 13:00:16 xmg systemd[823]: app-gnome-user\x2ddirs\x2dupdate\x2dgtk-1140.scope: Couldn't move process 1140 to requested cgroup '/user.slice/user-1000.slice/user@1000.service/app.slice/app-gnome-user\x2ddirs\x2dupdate\x2dgtk-1140.scope': No such process
Sep 24 13:00:16 xmg systemd[823]: app-gnome-user\x2ddirs\x2dupdate\x2dgtk-1140.scope: Failed to add PIDs to scope's control group: No such process
Sep 24 13:00:16 xmg systemd[823]: app-gnome-user\x2ddirs\x2dupdate\x2dgtk-1140.scope: Failed with result 'resources'.
Sep 24 13:00:16 xmg systemd[823]: Failed to start Application launched by gnome-session-binary.

Seems related to this old bug report, that some users still experience 1973058 – Many "Failed to start Application launched by gnome-session-binary" errors on boot

I see from your profile summary that you are on XFCE, but do you also have Gnome installed and you switch between the sessions? Using GDM or Lightdm? Is your system fully updated?