[otrs] How to uninstall SIRIOS ?

Hello, I have (by mistake) install SIRIOS. Now, I would like to uninstall it properly is there a specific procedure to do so ? We end up having an error on the first page (after login), complaining about an error ("Can't use an undefined value as a HASH reference at /opt/otrs//Kernel/Modules/AgentTicketQueue.pm line 723."). Currently, our system is not in production and I was thinking on reinstalling it from scratch. Regards, Vincent.