The above warning is obtained from the circuit shown below.
No, it isn't. Cocktail napkins don't give error messages.
Malformed netlists do. There isn't a "V2" on the napkin.
Some simulators don't like nodes and elements having
the same name, but that's not the emitted complaint.
It is a thing to beware, however. I prefer to call a
source driving node V2, "VV2" just for portability.
I suspect V2 is the 10V supply that's indicated by
a "tie" on your napkin sketch, and somehow not
connected to anything.
However it's also possible that the PMOSFETs are
subcircuits operating in "empty husk mode" because
you forgot to include the .model statements (there
would be other errors about that, and you should
not be asking about an excerpted error without being
sure there are none preceding it. Responding to the
tail of an error log is often futile for this reason.