[ns] diffserv in wireless

["ncs" <ncs@hbhs.buaa.edu.cn>]

hi all,
I want to simulate diffserv in wireless network.
I wrote a script according to wireless2.tcl in the 
tutorial and ds-cbr-tb.tcl in Nortel diffserv.
The topo is as below:
source----e1---core---e2---bs........dest(0,1,2)
When I run the script ,the message is followed:
the script is attached.

des is set 3
*** NOTE: no connection pattern specified.
Policy Table(1):
Flow (0 to 5): Token Bucket policer, initial code  point 10, CIR 1000000.0 bps, CBS 3000.0 bytes.

Policer Table:
Token Bucket policer code point 10 is policed to code point 11.

Starting Simulation...
warning: Route to base_stn not known: dropping pkt
warning: Route to base_stn not known: dropping pkt
warning: Route to base_stn not known: dropping pkt
ERROR: No Policy Table entry found for Source 0-Destination 8388609.
Policy Table(1):
Flow (0 to 5): Token Bucket policer, initial code  point 10, CIR 1000000.0 bps, CBS 3000.0 bytes.

Segmentation fault (core dumped)

What is the problem? What can I do with it?
thanks in advance.

wireless2.tcl