Problems with installing mail gem for Rails 3

I'm trying to install rails 3.0.7 on Mac OSX. I'm using rvm and I've got ruby 1.9.2p180 installed.

When I run

gem install rails --version 3.0.7

It seems to work fine, until it gets to the mail gem.

Fetching: mail-2.2.17.gem (100%)
ERROR:  While executing gem ... (Zlib::DataError)
    invalid block type

The 开发者_JAVA百科installer them stops and rails is not installed. How do I get around this?

Update: Since I asked this question the mail gem has been updated to 2.2.19, and this seems to have solved the problem.

I just replicated your env (MacOS, ruby 1.9.2) and rails installed fine, along with the mail gem (2.2.17).

Perhaps try again? Maybe the package that was fetched was temporarily corrupt. You can also run gem with the verbose flag to see more info:

gem install rails -V --version 3.0.7