Problems with bridge

[Alberto Rodriguez Galdo]

I have several access points using netgear 311 cards for the wireless part 
and 3com cards for the wired part. The problem is that i've set up a bridge 
between the two interfaces in one of the access point and i'm getting the 
next message:


eth0: received packet with  own address as source address

i created the bridge using this steps:

brctl addbr br0
brctl addif br0 eth0
brctl addif br'0 wlan0

then dhclient br0

previously the interfaces have ip address 0.0.0.0


What's the problem here? Have you seen this error before?