"Warning: require_once(/home/xxxxxx/libraries/joomla/document/html/renderer/head.php): failed to open stream: No such file or directory in /home/xxxxxx/templates/ps_awite/error.php on line 29
Fatal error: require_once(): Failed opening required '/home/xxxxxx/libraries/joomla/document/html/renderer/head.php' (include_path='.:/opt/alt/php56/usr/share/pear:/opt/alt/php56/usr/share/php') in /home/xxxxxx/templates/ps_awite/error.php on line 29
This error is caused by your template while it's processing another error. To be able to investigate the actual issue we first need to make sure your template is not producing an error anymore.
The error is triggered because /home/xxxxxx/templates/ps_awite/error.php is trying to load /home/xxxxxx/libraries/joomla/document/html/renderer/head.php which doesn't exist.
The file libraries/joomla/document/html/renderer/head.php has been moved in newer versions of Joomla. The facted that this error happens means that the developer of the template is directly loading core joomla file; which is bad practice. It also means that the template hasn't been updated.
We are happy to assist you, but its not possible for us to provide support on sites that are not completely updated or are running older versions of extensions or template that no longer support newer versions of Joomla."