AWP error on posts submenu (admin)

Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of xml_set_object(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file in ~/wp-content/plugins/aWP/xmlparser.php on line 16

Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of array_unshift(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in ~/wp-content/plugins/aWP/xmlparser.php on line 64

line 16:
xml_set_object($this->parser, &$this);

line 64:
array_unshift($this->parents, &$this->parent);