errors using scanner/smb/version

[Robin Wood <dninja () gmail com>]

I just got the following two errors when scanning with the SMB Version
Detection auxiliary. There is no machine on 192.168.0.3 and
192.168.0.0 shouldn't have been scanned.

After the errors it went on to successfully pick up the smb servers I
have running on the network.

I'm running version:

=[ metasploit v3.3.4-dev [core:3.3 api:1.0]
=[ svn r8001 updated today (2009.12.28)

msf > use scanner/smb/version
msf auxiliary(version) > set rhosts 192.168.0.0/24
rhosts => 192.168.0.0/24
msf auxiliary(version) > show options

Module options:

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   RHOSTS   192.168.0.0/24   yes       The target address range or
CIDR identifier
   THREADS  1                yes       The number of concurrent threads

msf auxiliary(version) > set threads 255
threads => 255
msf auxiliary(version) > run

[-] 192.168.0.3: NoMethodError undefined method `instance' for
Rex::Socket::SwitchBoard:Class
/usr/src/metasploit/lib/rex/socket/switch_board.rb:114:in
`best_comm'/usr/src/metasploit/lib/rex/socket/parameters.rb:165:in
`initialize'/usr/src/metasploit/lib/rex/socket/parameters.rb:21:in
`new'/usr/src/metasploit/lib/rex/socket/parameters.rb:21:in
`from_hash'/usr/src/metasploit/lib/rex/socket/tcp.rb:24:in
`create'/usr/src/metasploit/lib/msf/core/exploit/tcp.rb:95:in
`connect'/usr/src/metasploit/lib/msf/core/exploit/smb.rb:69:in
`connect'/usr/src/metasploit/lib/msf/core/exploit/smb.rb:216:in
`smb_fingerprint'(eval):54:in `run_host'(eval):47:in
`each'(eval):47:in
`run_host'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:92:in
`run'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`initialize'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`new'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`run'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:93:in
`job_run_proc'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:73:in
`run_simple'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:82:in
`run_simple'/usr/src/metasploit/lib/msf/ui/console/command_dispatcher/auxiliary.rb:143:in
`cmd_run'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:235:in
`send'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:235:in
`run_command'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:197:in
`run_single'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:192:in
`each'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:192:in
`run_single'/usr/src/metasploit/lib/msf/ui/console/driver.rb:347:in
`run_single'/usr/src/metasploit/lib/rex/ui/text/shell.rb:144:in
`run'./msfconsole:92
[-] 192.168.0.0: NoMethodError undefined method `instance' for
Rex::Socket::SwitchBoard:Class
/usr/src/metasploit/lib/rex/socket/switch_board.rb:114:in
`best_comm'/usr/src/metasploit/lib/rex/socket/parameters.rb:165:in
`initialize'/usr/src/metasploit/lib/rex/socket/parameters.rb:21:in
`new'/usr/src/metasploit/lib/rex/socket/parameters.rb:21:in
`from_hash'/usr/src/metasploit/lib/rex/socket/tcp.rb:24:in
`create'/usr/src/metasploit/lib/msf/core/exploit/tcp.rb:95:in
`connect'/usr/src/metasploit/lib/msf/core/exploit/smb.rb:69:in
`connect'/usr/src/metasploit/lib/msf/core/exploit/smb.rb:216:in
`smb_fingerprint'(eval):54:in `run_host'(eval):47:in
`each'(eval):47:in
`run_host'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:92:in
`run'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`initialize'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`new'/usr/src/metasploit/lib/msf/core/auxiliary/scanner.rb:86:in
`run'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:93:in
`job_run_proc'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:73:in
`run_simple'/usr/src/metasploit/lib/msf/base/simple/auxiliary.rb:82:in
`run_simple'/usr/src/metasploit/lib/msf/ui/console/command_dispatcher/auxiliary.rb:143:in
`cmd_run'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:235:in
`send'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:235:in
`run_command'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:197:in
`run_single'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:192:in
`each'/usr/src/metasploit/lib/rex/ui/text/dispatcher_shell.rb:192:in
`run_single'/usr/src/metasploit/lib/msf/ui/console/driver.rb:347:in
`run_single'/usr/src/metasploit/lib/rex/ui/text/shell.rb:144:in
`run'./msfconsole:92
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