Znuny Open Source Ticketsystem

Hi all, I cannot find a way to install OTRSAppointmentCalendar 5.0.2. I already run sudo apt-get install libdatetime-perl. It says me that is installed DateTime V 1.42, but during OTRSAppointmentCalendar returns me this error: Backend ERROR: OTRS-CGI-00 Perl: 5.24.1 OS: linux Time: Wed May 10 17:44:...