wireless master interface unknown

I have Mikrotik RB960PGS plus 2 pcs RBwAP2nD.
I setup wifi network working on CAPsMAN only for my devices from access list.
But I want to setup also hotspot to allow guest wifi without access to LAN.
I cannot do it at the moment.
When I try to create new virtual interface I got error “Master interface unknown”.
wifi.JPG

Here is my configuration
hotspot.txt (5.54 KB)

960 does not have wireless…