$this->trigger_template_error("Default plugin handler: Returned callback for \"{$tag}\" must be a static function name or array of class and function name");
$error_text='Syntax error in template "'.(empty($this->trace_filepath)?$this->template->source->filepath:$this->trace_filepath).'" on line '.($line+$this->trace_line_offset).' "'.trim(preg_replace('![\t\r\n]+!',' ',$match[$line-1])).'" ';