Could not find RubyGem mloughran-api_cache (>= 0)

I'm getting this error trying to do a rake 开发者_运维技巧db:migrate --> Could not find RubyGem mloughran-api_cache (>= 0)

Not I know that's a gem missing, But for some reason I can't find the whereabout of that gem. It's no the gem called api_cache. Or at least if it is, the system does not recognized that it is installed.

Any help would be really appreciated. Thanx. Yohann T

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This is what I show as the gem:

➜ gem list -r mloughran-api_cache

*** REMOTE GEMS ***

mloughran-api_cache (0.2.0)

with the following sources:

➜ gem sources
*** CURRENT SOURCES ***

http://gems.rubyforge.org
http://gems.github.com