unable to wash traffic through rules files

[don <bridon304 () rogers com>]

I am using snort 1.9.0 and am unable to get it to work pse see the below 
noted I would be most grateful for any ideas as
to what I am doing wrong. I am fully conversant with tcpdump/ethereal 
and the such but this is stumping me!!!

monkeylabs:/home/don/Documents/snort-1.9.0/src # ./snort -dvr 
/home/don/ch1.capture -A full -c netbios.rules
Initializing Output Plugins!
Log directory = /var/log/snort
TCPDUMP file reading mode.
Reading network traffic from "/home/don/ch1.capture" file.
snaplen = 65535

       --== Initializing Snort ==--
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file netbios.rules

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR: Unable to open rules file: netbios.rules or ./netbios.rules
Fatal Error, Quitting..
monkeylabs:/home/don/Documents/snort-1.9.0/src # ./snort -dvr 
/home/don/ch1.capture -A full -c 
/home/don/Documents/snort-1.9.0/rules/netbios.rules
Initializing Output Plugins!
Log directory = /var/log/snort
TCPDUMP file reading mode.
Reading network traffic from "/home/don/ch1.capture" file.
snaplen = 65535

       --== Initializing Snort ==--
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file /home/don/Documents/snort-1.9.0/rules/netbios.rules

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR => Undefined variable name: 
(/home/don/Documents/snort-1.9.0/rules/netbios.rules:8): EXTERNAL_NET
Fatal Error, Quitting..
monkeylabs:/home/don/Documents/snort-1.9.0/src #





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