[chef] knife create client creates nil pem

hello,

i'm following the instrux here:
http://wiki.opscode.com/display/chef/Package+Installation+on+Debian+and+Ubuntu

and when it comes to "knife client create", it's creating a pem file that
contains "nil". it's that pem file that i'd want to transfer to my
laptop so i can run knife from there. but i don't think a pem file
contain nil will help :>

know what i'm doing wrong here?

thanks,
kallen

details below:


 :~$
 lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 11.04
Release:        11.04
Codename:       natty

chef 0.10.2-2 is installed using "http://apt.opscode.com/ natty-0.10 main";.

we'll pick it up here: 


 :~$
 sudo cp /etc/chef/validation.pem /etc/chef/webui.pem ~/.chef

 :~$
 sudo chown -R kallen:kallen .chef/

 :~$
 knife configure -i
WARNING: No knife configuration file found
Where should I put the config file? [~/.chef/knife.rb]
Please enter the chef server URL: [http://cheftain2.example.com:4000]
Please enter a clientname for the new client: [root] kallen
Please enter the existing admin clientname: [chef-webui]
Please enter the location of the existing admin client's private key: 
[/etc/chef/webui.pem] .chef/webui.pem
Please enter the validation clientname: [chef-validator]
Please enter the location of the validation key: [/etc/chef/validation.pem] 
.chef/validation.pem
Please enter the path to a chef repository (or leave blank):
Creating initial API user...
Created client[kallen]
Configuration file written to /home/kallen/.chef/knife.rb


 :~$
 knife client list
  chef-validator
  chef-webui
  cheftain2.example.com
  kallen


 :~$
 knife client show kallen
_rev:        1-38d3fc208eb2569f1b781fd4d9f5a781
admin:       true
chef_type:   client
json_class:  Chef::ApiClient
name:        kallen
public_key:  -----BEGIN RSA PUBLIC KEY-----
             MIIBCgKCAQEA1+kdbZMGZ6vvVsLhfUobqPvaRtc4RhXQAXvDCmSf6Bd8nb9UEU1B
             jPjioF/Tgnm5IahCgaipVwqFbauoqtEgdJR4s8mAFS5UgShnFZZjjvmsirpWAASy
             09zbHLLWJyCIdrUeCCrxGuu4isiLHjcdQc3VCflFZ8kQqj1UJf993/H4Pi7l5vvN
             rOriyQk8JfR/UhF+oQxKOgfUQwyjxoO0SMysuyk7BC6g4f4IMtW7/GGBehYp3dJK
             lwP1IGpMab01i80qO1dJhDZZaYOSD/ITD/h5qt9n4MEBzO/M8nVFrEUzqaa4JZid
             h8FmELrxRK3r4fCP/ang7GSW2tNVQlk7KQIDAQAB
             -----END RSA PUBLIC KEY-----


 :~$
 knife client create kallen -n -a -f /tmp/kallen-chef.pem
Created client[kallen]

 :~$
 cat /tmp/kallen-chef.pem

 :~$