Regular users are not able to use the gem as it's permissions are too strict. Happened with xml-mapping 0.8.1, rubygems
1.2.0, ubuntu 8.10.

Date: 2010-05-21 12:08
Sender: Olaf Klischat

Damn. I'm at a loss explaining how this happened. The new 0.9
gem doesn't show this behavior anymore. I'll switch to github
in the near future and can't be bothered to create a CVS branch
for the corrected 0.8.1 gem before that (the 0.8.1 Rakefile can't
create the gem with newer RDoc versions anymore -- this is fixed
in 0.9).

Date: 2009-01-28 19:49
Sender: Neil Heinrich

This should fix the permissions issues.

sudo chmod -R a+r /Library/Ruby/Gems/1.8/gems/xml-mapping-0.8.1


Or wherever your install happens to be. 

Date: 2009-01-28 11:51
Sender: Neil Heinrich

I believe I am also having this problem.

xml-mapping 0.8.1
rubygems 1.3.1
leopard