Change addPosts to wor either as documented or change documentation

[Seriousness]

Instead of
$my_meta->addPosts('posts_field_id',array('post_type' => 'post'),array('name'=> 'My Posts '));
the necessary argument would be
$my_meta->addPosts('catpage',array( 'args' => array('post_type' => 'page')),array('name'=> 'My Pages '));

Tax-Meta-Class/Tax-meta-class/Tax-meta-class.php

Line 1600 in a8acfdb

$temp = array('type'=>'select','args'=> array('posts_per_page' => -1, 'post_type' =>'post') );

To change this I'd suggest:

$temp =  array('posts_per_page' => -1, 'post_type' =>'post') ;
$options = array('type'=>'select', 'args'=> array_merge($temp,$options));

Sorry I was too lazy to go through the whole clone - push - pull request routine