jos-Error: Syntax Error in template "/home/web/htdocs/clust-epj/templates/epj/tmpl/error.tpl" on line 73 " <li><a href="{JRoute::_(`$site`/index.php?option=com_solr)}">Advanced search</a>" - Unexpected "`", expected one of: ")"

JSite -> dispatch() @ /home/web/htdocs/clust-epj/index.php:43
JError :: raiseError() @ /home/web/htdocs/site-source-j25/includes/application.php:208
JError :: raise() @ /home/web/htdocs/site-source-j25/libraries/joomla/error/error.php:257