Thanks everyone for all the help! I got rid of the error by once more wiping out the cvmfs directories with apt purge cvmfs* and removing everything in /etc/cvmfs. I then also ran the ansible-galaxy install -p roles -r requirements.yml --force command and changed the main.yml file to contain the right syntax for the combination of lists before I ran the playbook again and the error was gone! Unfortunately a new error occured imediately, which I might open another question for and link here.
For anyone else who ran into this error and ran into another error regarding the setup of cvmfs after solving it, check out the next question: ERROR while checking CERNVM-FS for setup.
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