
/modules/apcal/
with
/modules/APCal/
and it resolved many bugs.
There were about a hundred.
I will make a pull request.
Warning: require_once(/modules/apcal/class/APCal.php): failed to open stream: No such file or directory in file /modules/APCal/admin/index.php line 25
Warning: require_once(/modules/apcal/include/ro_contacthandler.php): failed to open stream: No such file or directory in file /modules/APCal/class/APCal.php line 26
Warning: require_once(/modules/APCal /class/APCal.php): failed to open stream: No such file or directory in file /modules/APCal/index.php line 80