AN ERROR OCCURED!

URI:
http://www.pakte.at/rahmendok/teppub/list

Class/Method:
TEP::Rahmendok::TEPPub->list()

Error message:
Failed to call hook make_subnav with Arguments : Can't call method "id" on an undefined value at /usr/local/SEAS3/sites/tep2/lib/TEP.pm line 351.

Additional messages:

• stack:
  SEAS::fill (/usr/local/SEAS3/lib/SEAS/Area.pm line 288)
  SEAS::Area::list (/usr/local/SEAS3/lib/SEAS/Engine/ModPerl2.pm line 111)
  (eval) (/usr/local/SEAS3/lib/SEAS/Engine/ModPerl2.pm line 110)
  SEAS::Engine::ModPerl2::handler (-e line 0)
  (eval) (-e line 0)
• type:
  Hook Error