If the administrator account (which was originally created when initial setup wizard was run) has been deleted locally and another new administrator account was created, then it is not possible to create user via web. Only locally is possible, as the application is still looking for the original admin account.
A workaround here would be to default your Divar Network and follow the setup wizard > this will create the administrator user again and will let you create new users again.
Or create the new users locally on your Divar.
Bosch strongly recommends upgrading to the latest firmware for the best possible functionality, compatibility, performance and security.
Check http://downloadstore.boschsecurity.com/ regularly to see if there is a new firmware version available.