I had exactly the same problem word for word as the OP described with my 2011 Granturismo MC.
Fortunately the fix is relatively inexpensive for a Maserati.
The problem is the Gearbox actuator and you will need a Maserati expert to carry out an actuator internal bleed as well as checking and...
I had exactly the same issue at 53,000 kilometres.
It needed a new clutch so it won't let you shift past 2nd. Had exactly the same warning light as well Frustratingly I had only just bought the car and I was 100ks away from home so I put it on a tow truck. I wish I knew about the option to...