Judging by that error, are you using the 'Alt' template in Dolphin 7.1? If so, do you get the error if you switch the template to 'Uni' instead?
Below is the legacy version of the Boonex site, maintained for Dolphin.Pro 7.x support.
The new Dolphin solution is powered by UNA Community Management System.
The new Dolphin solution is powered by UNA Community Management System.