Hi, I get the same error and this is what debug replys :
CalendarScript Debugger
It appears that you are running mod_perl on your server, and this script is running under it. CalendarScript does not support running under mod_perl. It must either be disabled or the script must be placed in a directory which is not under mod_perl control. Once this problem is fixed, please re-run this debugger to check for any further errors!
Thanx,
Kurt