i logged an issue about it last week:
http://ironruby.codeplex.com/workitem/5326

not sure why it works on a clean vm but it seems to be failing for
quite a few people

On Mon, Oct 25, 2010 at 2:36 PM, Kevin Radcliffe
<kevin.radcli...@gmail.com> wrote:
> Getting the same when installing sinatra (even from an elevated admin
> prompt):
> C:\Windows\system32>igem install --no-ri --no-rdoc sinatra
> ERROR:  While executing gem ... (TypeError)
>     can't convert NilClass into String
> Any idea how we can add more trace info to the output to see where we're
> getting caught?
> Thanks
> Best Regards,
> Kevin Radcliffe
> On Mon, Oct 25, 2010 at 1:05 PM, Ryan Riley <ryan.ri...@panesofglass.org>
> wrote:
>>
>> I don't have GEM_PATH/GEM_HOME defined anymore. The only other ruby in my
>> path is C:\Users\ryan\.gem\ironruby\1.8\bin, which isn't a Ruby. Actually, I
>> don't remember what that's from. I also have pik in my path, which I use to
>> switch between different rubies on Windows. I added IR 1.1.1 through the pik
>> add option. However, I've tried it both within pik and on its own. Neither
>> works.
>> I do have IRONRUBY_10_20, IRONRUBY_11, and IRONRUBY_11_40 environment
>> variables. I removed those, too, to no effect. I don't know why IR would
>> have suddenly stopped working for me. Do I need to clear out my IronRuby1.1
>> folder? I've already deleted the folder several times trying to start over.
>>
>> Ryan Riley
>>
>>
>> On Sun, Oct 24, 2010 at 8:29 PM, Tomas Matousek
>> <tomas.matou...@microsoft.com> wrote:
>>>
>>> If not, that should should've reported an error like:
>>>
>>> C:\Users\tomat>igem install rspec --no-ri --no-rdoc
>>> ERROR:  While executing gem ... (Errno::EACCES)
>>>    Access to the path 'C:\Program Files\IronRuby
>>> 1.1\Lib\ruby\gems\1.9.1\cache\rspec-core-2.0.1.gem' is denied.
>>>
>>> Works as expected on a clean VM with IronRuby 1.1.1 installed:
>>>
>>> C:\Temp>igem install rspec --no-ri --no-rdoc
>>> **************************************************
>>>
>>>  Thank you for installing rspec-core-2.0.1
>>>
>>>  Please be sure to look at Upgrade.markdown to see what might have
>>> changed
>>>  since the last release.
>>>
>>> **************************************************
>>> Successfully installed rspec-core-2.0.1
>>> Successfully installed diff-lcs-1.1.2
>>> Successfully installed rspec-expectations-2.0.1
>>> Successfully installed rspec-mocks-2.0.1
>>> Successfully installed rspec-2.0.1
>>> 5 gems installed
>>>
>>> C:\Temp>igem install rack sinatra --no-rdoc --no-ri
>>> Successfully installed rack-1.2.1
>>> Successfully installed tilt-1.1
>>> Successfully installed sinatra-1.1.0
>>> 3 gems installed
>>>
>>>
>>> Don't you have some other Ruby/IronRuby installation on your path (or
>>> GEM_PATH/GEM_HOME)?
>>>
>>> Tomas
>>>
>>> -----Original Message-----
>>> From: ironruby-core-boun...@rubyforge.org
>>> [mailto:ironruby-core-boun...@rubyforge.org] On Behalf Of cory....@gmail.com
>>> Sent: Sunday, October 24, 2010 5:21 PM
>>> To: ironruby-core@rubyforge.org
>>> Subject: Re: [Ironruby-core] [ANN] IronRuby 1.1.1 Released!
>>>
>>> Ryan,
>>>
>>> Just a thought - have you tried running from an elevated command prompt?
>>>
>>> Cory
>>> Sent from my Verizon Wireless BlackBerry
>>>
>>> -----Original Message-----
>>> From: Ryan Riley <ryan.ri...@panesofglass.org>
>>> Sender: ironruby-core-boun...@rubyforge.org
>>> Date: Sun, 24 Oct 2010 15:33:14
>>> To: <ironruby-core@rubyforge.org>
>>> Reply-To: ironruby-core@rubyforge.org
>>> Subject: Re: [Ironruby-core] [ANN] IronRuby 1.1.1 Released!
>>>
>>> _______________________________________________
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>>>
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>>
>>
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