[Spot] genaut --ks-nca error

Hi, when using genaut --ks-nca e.g. genaut --ks-nca=1..10 I get the following error: genaut: print_hoa(): automaton is complete but prop_complete()==false Is this a bug? What can I do to get the desired result? I am using spot version 2.4.1 on Ubuntu 16.04. Best regards, Florian Barta