Seems like this is a PHP issue: I’m using PHP 5.0.5 and had this error also.
I changed the code at line 379 to the following and it worked:
$post = get_post(( wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft' ) ) ));
You’ll notice the only difference is a set of double parenthesis inside the get_post method call.
