The error handler has found that you are using Community Builder related functionality but Community Builder is not installed in your Joomla setup.

[Solution 1] Disable Community Builder support

Live Users Pro has been developed to tightly integrate with Community Builder an the advanced profiling options it offers. Nevertheless you have the possibility to disable Community Builder support alltogether and use the module as it is. However be aware that a lot of the functionality of the module will not be available.

To disable Community Builder support proceed as follows:

• Choose  "Modules -> Site Modules" from the menu bar.
• Klick on "Live Users Pro" in the module list
• Set the "Community Builder support" parameter  to "No"
• Click "Save"

[ Solution 2] Install Community Builder

Community Builder is a component that offers a wealth of community functionality as well completly customizeable user profiles. It features plugins to extend to almost any conceivable requirements. If you are running a community centred website you should really consider to add it to your installation.

You can find the Community Builder homepage at
http://www.joomlapolis.com

After succesfull registration you can download the component itself as well as further documentation and a great selection of plugins. Besides the extensive documentation the very active forums offer support for any kind of questions.