For Helix QAC to run properly the environment must have the HOME environment variable set. This is normally set by the OS. If you are unable to have HOME set then you can set the alternative environment variable XDG_CONFIG_HOME to point to an existing directory that Helix QAC will use to store its data. Alternatively, you may set the environment variable HELIX_QAC_UDL to point to the location where you wish to store your User Data Location. See Environment Variables for more details.