sqlite3.rb:9:in `require': cannot load such file -- sqlite3/database (LoadError)

trying to work with scaffold in ruby im working on windows7 but we got an error like

C:\row\dev\blog_blog>rails g scaffold post title:string text:text
c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.11-x86-mingw32/lib/sqlite3.rb:9:in `require': cannot load such file -- sqlite3/database (LoadError)
from c:/row/Ruby200/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.11-x86-mingw32/lib/sqlite3.rb:9:in `<top (required)>'
.
.
.
from bin/rails:4:in `<main>'

could anyone help me with this???