Installed CodoForum on CentOS7, php 5.4+, mariadb, Apache 2.4. Installation went well. I can get to the back-end but I can't get to the front-end. I can't Edit Cron Jobs because of the same error.

Fatal error: Cannot redeclare render() in /var/www/codoforum/sys/Ext/limonade/limonade.php on line 1479

Another Problem is that SMTP doesn't seem to be working. I have a local SMTP server I always use for development and it works with other scripts but CodoForum.

Can you try redownloading and reinstalling codoforum ? Maybe try installing in local setup once?

I retried but I kept on getting the same error. I ended up switching from CentOS7 to Debian8 and everything worked. I think there are too many php extensions enabled on the CentOS dev VM and they somehow cause problems.