Followed this tutorial (http://nerdvittles.com/?p=27089) for Cent OS 6.10 and am able to successfully install Incredible PBX. pbxstatus reports everything is "UP" except fax items (I didn't install them). But, I cannot access the Web GUI. I get HTTP 500. How can I fix this? Webmin Web GUI does, only the Incredible PBX Web GUI is broken.