[otrs] Pending Auto-Close tickets

I must be doing something wrong. First a quick question: What's the difference from pending auto close + and pending auto close - ? Every ticket we put on pending auto close +, after reaching the pending time, it gerenates a email with the following error: Subject: Cron $HOME/bin/PendingJobs.pl >> /dev/null X-Cron-Env: X-Cron-Env: X-Cron-Env: X-Cron-Env: X-Cron-Env: ERROR: No StateAfterPending found for 'pending auto close +' in Kernel/Config.pm! ERROR: No StateAfterPending found for 'pending auto close +' in Kernel/Config.pm! What could be wrong ?