Hi
Your problem is most likely that your system either doesn't support fan
control, or it has not been manually enabled (that's what the error
message says after all).
See also thinkfan's README.Debian reproduced below.
thinkfan for Debian
-------------------
WARNING!
thinkfan CAN kill your system and is thus disabled by default
If you really want to enable thinkfan, adjust /etc/thinkfan.conf to your
needs and set START=yes in /etc/default/thinkfan.
If you are using systemd, use “systemctl enable thinkfan.service” — as is
customary with systemd, thinkfan.service ignores /etc/default/thinkfan.
Additionally, on ThinkPads, you need to load the thinkpad_acpi module with
fan_control=1, or it will refuse to accept control from thinkfan.
That's most easily done with a file /etc/modprobe.d/thinkfan.conf and the
following entry in it:
options thinkpad_acpi fan_control=1
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