Using nmap for network scan

Hi !

I'm trying to use nmap to make some scans on my private network over my CT (Debian 7).

Unfortunately, with this command :
nmap 192.168.0.0/24 -n -sU -p161 -T5 --max_retries=1 --host_timeout=150ms --max_rtt_timeout=10ms

I get this error :
I'm using the venet0:0 interface, and it seems to be an implementation problem from nmap.

Anyone got a solution to make it working over venet ?

Thx !
Vince.