Nemo Cassandrae res futuras praedicenti credebat.
Orberg habet responsum quod super est in LLPSI exercitia pars ii.
I imagined that the dative object that no one believed would be the entire 'res futuras praedicenti'...
so it should read:
Nemo Cassandrae rebus futuris praedicenti credebat....
Or is it dative Cassandrae that is not being believed...? But then how does the sentence work. What are 'res futuras' objectives of....?