Route not known in mixed scenario

[Anastasia Leventi-Peetz <leventi@fgan.de>]

  Dear all,

    I have modified a little bit the wireless2.tcl file, giving
simply -routerTrace ON and switching -energyModel on.

I get suddenly the strange message 

warning: Route to base_stn not known: dropping pkt


For those who are not very familiar to the pattern, three wired nodes
(one of them serves as base station) and three mobile nodes are included
in the plot. I'll greatly appreciate any suggestion how can I set
a route.

many thanks:Anastasia