gems 0.9にあったrequire_gemというコマンドが、1.0ではgemに変わったかららしい。
こういうときは、以下のコマンドが直してくれるんだそうな
H:\Rails\hondana>gem pristine --all Restoring gem(s) to pristine condition... activerecord-1.15.6 is in pristine condition ibm_db-0.9.4-x86-mswin32 is in pristine condition actionmailer-1.3.6 is in pristine condition rubygems-update-1.1.1 is in pristine condition activerecord-2.0.2 is in pristine condition rake-0.8.1 is in pristine condition activesupport-1.4.4 is in pristine condition actionwebservice-1.2.6 is in pristine condition activesupport-2.0.2 is in pristine condition actionpack-1.13.6 is in pristine condition rails-1.2.6 is in pristine condition
