Problemas com Template

Boa Tarde, instalei um template Joomla e a seguinte mensagem está sendo exibida na index. Versão Joomla 1.5 Template da Joomlart, rodando em XAMPP. Se alguém puder ajudar, ficarei grato.

Warning: Parameter 1 to plgContentJA_tabs::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentPlg_JAThumbnail::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentEmailCloak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentLoadModule() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentPagebreak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentJA_tabs::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentPlg_JAThumbnail::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentEmailCloak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentLoadModule() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentPagebreak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentJA_tabs::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentPlg_JAThumbnail::onPrepareContent() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\event.php on line 67

Warning: Parameter 1 to plgContentEmailCloak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentLoadModule() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136

Warning: Parameter 1 to plgContentPagebreak() expected to be a reference, value given in C:\xampp\htdocs\comunidade\libraries\joomla\event\dispatcher.php on line 136