Got xhtml page

[Preovaleo]

hello;

i got phplist v3.2.4 and when i try the demo script at the end of the readme i got

PHP Notice: Trying to get property of non-object in example.php on line 17 PHP Stack trace: PHP 1. {main}() example.php:0 example.php:17: NULL PHP Notice: Trying to get property of non-object in example.php on line 31 PHP Stack trace: PHP 1. {main}() example.php:0 example.php:31: NULL

i investigate a little and find out that the curl retrive an xhtml page and not a json. Do i make something wrong?