I wanted to suggest the same. I nearly took off on a 100 mile trip to my dealership, in a rage, because my slides wouldn't go out. I assumed the worst.
Fortunately, I thought back over my very short (& I thought unnecessary) PDI instruction & moved the seat forward - wala, all fixed.
BTW, the parking brake "on" is also an interlock for some functions. I think it is the levelers, though could be for all hydraulics. I take no chances; parking brake on, then seat forward whenever setting up & tearing down.
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