fakewap error

I use fakewap's option '-s',but wapbox.log report error as follow:
2002-09-18 10:47:27 [5] DEBUG: WTP 1: New state RESULT_RESP_WAIT
2002-09-18 10:47:27 [0] WARNING: WTP PDU with unknown type -1
2002-09-18 10:47:27 [0] ERROR: pdu unpacking returned NULL
2002-09-18 10:47:27 [0] DEBUG: A too short PDU received
2002-09-18 10:47:27 [0] DEBUG: Dumping WAPEvent 0x8154620
2002-09-18 10:47:27 [0] DEBUG:   type = T-DUnitdata.ind
2002-09-18 10:47:27 [0] DEBUG: WAPAddrTuple 0x81514d8 = <192.168.6.150:2525> - <
0.0.0.0:9201>
2002-09-18 10:47:27 [0] DEBUG: user_data =
2002-09-18 10:47:27 [0] DEBUG:  Octet string at 0x8151608:
2002-09-18 10:47:27 [0] DEBUG:    len:  0
2002-09-18 10:47:27 [0] DEBUG:    size: 0
2002-09-18 10:47:27 [0] DEBUG:    immutable: 0
2002-09-18 10:47:27 [0] DEBUG:  Octet string dump ends.
2002-09-18 10:47:27 [0] DEBUG: WAPEvent dump ends.
2002-09-18 10:47:27 [0] PANIC: wap/wap_events.c:161: wap_event_assert: Assertion
 `event != NULL' failed.
please help me.


thanks 
                                              lijl