Trouble With db:migrate

I'm just learning Rails and working on a simple blog application. I
have everything installed properly (so it seems) but when I run rake
db:migrate I get this error:

Could not find i18n-0.6.1 in any of the sources

I've looked at a couple different sources to try and find what could be
wrong, reinstalled, updated gems but still doesn't seem to be working.

Any help would be greatly appreciated.

Thanks!

How about trying:

.../your_app$ bundle install

And then

.../your_app$ bundle exec rake db:migrate