From the symbol at the nodes, you can see that the diode model is not properly connected in schematic. Not sure why - user mistake or possibly mistake in definition of the symbol, but anyway: there is no connection.
Regarding possibly unconnected nets, have a look at the netlist: Simulate > Generate Netlist
P1: I think this is required for impedance matching, you need to have an S-parameter simulation and corresponding "Term" element defined for the input port. That is missing in your schematic.