HI, i am working in Rails .. my gem list is
*** LOCAL GEMS *** abstract (1.0.0) actionmailer (3.0.4, 3.0.3, 2.3.11, 2.3.10, 2.3.8, 2.3.4, 2.3.2) action
This could be because you have rails 3 installed but are trying to run a rails 2.3.4 app. I've had this problem before and the solution was to remove rails 3 because this dependency is one of rails 3, not 2.3.4