invalid byte sequence in US-ASCII (Ruby 1.9 + rails 2.3.8 + mongodb + mongo_mapper)

Question

My setup is:

linux + Ruby 1.9 + rails 2.3.8 + mongodb + mongo_mapper

I followed http://railscasts.com/episodes/194-mongodb-and-mongomapper, that everything is OK

Answer 1

For me the problem was that I was using an older version of ruby. rvm use 2.0 did the trick.