How to deal with error message: Couldn't add New Interface - ssid must be specified for AP modes (6)

Trying to follow a bit similar steps to this guide: https://docs.hotspotsystem.com/en/articles/765714-create-multiple-ssids-virtual-ssid-for-mikrotik

This is the error that I am seeing: Couldn't add New Interface - ssid must be specified for AP modes (6)
See attachment for a screenshot

Why am I not allowed to create a new Virtual Interface ?

Note that I am new in Mikrotik interfaces
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You need to put in the SSID as you define an AP (access point).
Just give any name you want into the SSID field…