I've fixed it. Thanks for your answers! There is however a problem in the instructions:
[] Open pp-inc.php
Find:
require "config-inc.php";
require "languages/$pplang/pp-inc.php";
Insert Below this and set path to main-inc.php:
/// Require the library. Edit the path to the
// main.inc.php file if necessary.
require ("/PATH/TO/main.inc.php");
// If you use IIP's sidebar you may want to uncomment the line below
// to disable the sidebar on Photopost pages
// $config['iip_call'] = 1;
[/]
It should also have:
[]
require ("/PATH/TO/templates/default/tbopen.tmpl");
require ("/PATH/TO/templates/default/tbclose.tmpl");
[/]
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