msfpayload and msfencode problems

[ramatkal at hotmail.com (sol seclists)]

Having some problems with msfpayload and msfencode....

im trying to generate a win32 bind shell payload which has no '~' (\x7e) characters in it (as well as the usual \r\n). 
Below is the command i used:

msf > msfpayload win32_bind R | msfencode -t c -e ShikataGaNai -b "\x00\x0d\x0a\x7e"
[*] Bad character list format is "\x00\x01\x02"

i then had a bit of a play with the -b flag, but still no luck. 

msf > msfpayload win32_bind R | msfencode -t c -e ShikataGaNai -b "\x00"
[*] Bad character list format is "\x00\x01\x02"
msf > msfpayload win32_bind R | msfencode -t c -e ShikataGaNai -b \x00
[*] Bad character list format is "\x00\x01\x02"
msf > msfpayload win32_bind R | msfencode -t c -e ShikataGaNai -b '\x00'
[*] Bad character list format is "\x00\x01\x02"
msf > msfpayload win32_bind R | msfencode -t c -e ShikataGaNai -b "\x00\x01\x02"
[*] Bad character list format is "\x00\x01\x02"
msf >

If i leave off the -b flag, it generates the payload correctly. Anyone got any ideas?

Thanks,
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