Piaware: permission denied

Hi

I have 2 pi’s under my control at 2 different locations, already running dump1090-fa for a few other ADS-B services. I wanted to add flightaware to feed to, however piaware does not seem to run.
The pi’s are both pi 3b+ and run raspbian bullseye 64 bit.

pi@SDRsetup:~ $ piaware
2023-02-14 12:40:14Z failed to reopen /var/log/piaware.log: couldn't open "/var/log/piaware.log": permission denied
2023-02-14 12:40:14Z ****************************************************
2023-02-14 12:40:14Z piaware version 8.2 is running, process ID 1830901
2023-02-14 12:40:14Z your system info is: Linux SDRsetup 5.15.84-v8+ #1613 SMP PREEMPT Thu Jan 5 12:03:08 GMT 2023 aarch64 GNU/Linux
2023-02-14 12:40:15Z Connecting to FlightAware adept server at piaware.flightaware.com/1200
2023-02-14 12:40:15Z Connection with adept server at piaware.flightaware.com/1200 established
2023-02-14 12:40:16Z TLS handshake with adept server at piaware.flightaware.com/1200 completed
2023-02-14 12:40:16Z FlightAware server certificate validated
2023-02-14 12:40:16Z encrypted session established with FlightAware
2023-02-14 12:40:16Z logged in to FlightAware as user guest
2023-02-14 12:40:16Z my feeder ID is 3c45d736-8f6a-4276-bab8-ef035bd414a3
2023-02-14 12:40:16Z Failed to update feeder ID file at /var/cache/piaware/feeder_id: couldn't open "/var/cache/piaware/feeder_id.new": permission denied
2023-02-14 12:40:16Z site statistics URL: https://flightaware.com/adsb/stats/site/192551
2023-02-14 12:40:17Z ADS-B data program 'dump1090-fa' is listening on port 30005, so far so good
2023-02-14 12:40:17Z Starting faup1090: /usr/lib/piaware/helpers/faup1090 --net-bo-ipaddr localhost --net-bo-port 30005 --stdout
2023-02-14 12:40:17Z Started faup1090 (pid 1830934) to connect to dump1090-fa
2023-02-14 12:40:17Z UAT support disabled by local configuration setting: uat-receiver-type
2023-02-14 12:40:17Z piaware received a message from dump1090-fa!
2023-02-14 12:40:17Z piaware has successfully sent several msgs to FlightAware!

Any idea how to solve this? I have followed the following guide to install it: rpi/README.md at master · abcd567a/rpi · GitHub

Thanks!