Hi, Mykl,
Please refer to the Installation Manual embedded within the
distribution tarball (.../ck-admin/doc/Installation Manual.html).
You'll find that the relevant fully tested (MiddleWare + CK-ERP +
Webserver environment) combo.
For CK-ERP 0.31.1 and WebCalendar,
The fully tested combo is,
WebCalendar 1.2.5; Fedora16; binami-lappstack 5.3.10
(Apache2.2.22/Pgsql 9.1.1/ PHP 5.3.10)
Please ensure that your operating environment is as close to the
fully entested environment as possible.
Best Regards,
CK