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Radicale always tries to load the system-wide configuration file. To turn this off, the logging-config option has to be added to all configuration files and command line arguments. It's easier to disable it by default and only add it once to the system-wide config file.
Radicale is a free and open-source CalDAV and CardDAV server. For complete documentation, please visit the Radicale online documentation (http://www.radicale.org/documentation).