Cannot run programs in my prison

I am trying to run a Behavioral Therapy program in my prison and I think I get all necessary requirements. I have a psychologist and a full office empty with many chairs. But the program continue to say that "All Rooms Are Booked".

How can I solve?

In this screen you can see a free office with chairs and the psychologist office that have to run the Behavioral Therapy.

And here it is the current Regime.

Solution 1:

You need to assign more "Work" hours in the regime tab.

If you have a closer look, by default there are only two consecutive work-blocks. Some programs need three (or more?) consecutive work blocks. So does the educational lesson.

The feedback "ALL ROOMS BOOKED" is not very helpful here, I ran into that, too.

Thank you for confirming it was "work" @Amadeus9.