The errors are all pointing to the radarbox repository so they are not related to flightaware or piaware.
You could remove the piaware software completely and then reinstall it. After reinstallation you can import your old key again so you don’t get a new site number.
first command is to remove the software, after that follow the steps on the installation page.
sudo apt purge piaware
It will ask you if you want to remove the software and you have to confirm that.
After that follow the steps here:
Start with step 2 , you don’t need step 5 and then skip step 7
After this is complete you can reregister your old unique identifier via this post
I see you got it fixed while I was typing this reply, good that you are back up and running 