If you have issues on your registration page with DJ-Classifieds with such error:
Go to: Extensions -> Plugins, search for User - Profile plugin and click to edit it
Once editing the plugin makes the "Terms of Service" setting to "Disabled"
and Save the plugin.
In addition, it is required to unpublish the 'User - Terms and Conditions' plugin in the Joomla backend. It blocks the registration and settings from the "User - Profile" by default, although they are correctly configured will not work.