actually it doesnt belong into the server.cfg.
make a new cfg inside ur pb folder and name it pbsvuser.cfg
then u can either restart pb with pb_sv_restart or u just load the cfg with pb_sv_load pbsvuser.cfg
to check if the tasks are there u can us pb_sv_tlist
(execute all those commands via rcon eg. via hlsw or ingame console after /rcon login PASSWORD)