From: cristian cristian Date: 2013-08-02T18:15:14+09:00 Subject: Re: Beginners problem with database and datamapper Thank you for the suggestion Joel. I followed Scotts instructions and yet theres a problem. Why does this work fine when I use datamapper? Here's the error message when I follow Scotts instructions. C:\knapsack>gem install sqlite3 --platform=ruby --with-opt-dir=C:/Knapsack ERROR: While executing gem ... (OptionParser::InvalidOption) invalid option: --with-opt-dir=C:/Knapsack Br cristian -- Posted via http://www.ruby-forum.com/.