Yes, I’ve asked for issues to be reported here, so that you can get answers from the larger community of WordPress users and developers at WordPress Answers.
Regarding the issue, other user also reported it, and it is due to the webhost using PHP 4. Line 10 of CatListDisplayer.php declares a private attribute. PHP 4 doesn’t have public, private or protected accessors.
Is there a way to ask your webhosting provider to update your server to PHP 5?
The other possible solution is to download the previous version of the plugin: 0.16, which doesn’t use Object Oriented PHP.
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