[otrs] Software error: cant write

Hey im getting an error every time i try to create a ticket (fresh install or OTRS 2.0.4): Software error: Can't write /opt/otrs/var/log/TicketCounter.log: at ../..//Kernel/System/Ticket/Number/DateChecksum.pm line 87. For help, please send mail to the webmaster (webmaster@localhost mailto:webmaster@localhost), giving this error message and the time and date of the error. looking at 87 die "Can't write $CounterLog: $!"; The TicketCounter.log file exists and has the correct permissions. I dont know perl so i have no idea what the rest around Line 87 means. any ideas ??? thnks in advance. -J