[Click] Hardware Error when using Click with 7.3.20-NAPI

[Manel.BOURGUIBA at lip6.fr]

Hi everybody,I am a new Click user. I am using the 7.3.20-NAPI e1000 driver.
I have the following error when running udpgen.click :

e1000_poll_on
click: starting router thread pid 5063 (ffff81006bb3cdc0)
e1000: eth0: e1000_reset: Hardware Error
ToDevice eth0 rejected a packet!
e1000: eth0: e1000_watchdog1: NIC Link is Down
e1000: eth0: e1000_reset: Hardware Error

Can you help me, I've been stuck for a long time!!
Thanks