[otrs] undefined subroutine Kernel::System::JSON::False

Hi all, After moving my otrs instance from 2.x to 3.0.8 I get the following error in the ssl_error_log when I try to move a ticket into a new queue and it looks up possible owners: [Mon Jun 27 12:12:15 2011] [error] [Mon Jun 27 12:12:15 2011] -e: Undefined subroutine &Kernel::System::JSON::False called at /opt/otrs//Kernel/Output/HTML/LayoutAJAX.pm line 91.\n I checked LayoutAJAX.pm (latest version according to CVS), I also checked JSON.PM (also latest version) and sub False exists. Does anyone have an idea? Thanks, Nico