[framework] undefined method `strip' for nil:NilClass error

[cycl0ne dude]

Hi guys,

When I tried the exploit/unix/webapp/squirrelmail_pgp_plugin, I received the
following error:

       =[ msf v3.1-dev
+ -- --=[ 251 exploits - 116 payloads
+ -- --=[ 17 encoders - 6 nops
       =[ 43 aux

msf exploit(squirrelmail_pgp_plugin) > exploit
[*] Connecting to SMTP server 192.168.30.102:25...
[-] Exploit failed: undefined method `strip' for nil:NilClass
msf exploit(squirrelmail_pgp_plugin) >

I'm using Kubuntu, updated gem etc, and the required parameters are set.
Please help.
Thanks.
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