Ruby on Rails

Hi i am a ruby on rails programmer with almost a year experience i am
having problems using the asset tag helper in rails 3.1. if i do
something like
<% image_tag('rails.png') %> the image does not get displayed. if i
check my server log, i realized that it cannot find the image. That is
for images. As for SCSS style sheet it works but whenever i refresh my
browser i get a default template. then my server log says undefined
method >= for nil:NillClass. i dont no what to do at this moment. if i
switch to rails 3.0.7 it all works fine but SCSS does not work at all.
I'm using railsinstaller 1.1.1 with ruby 1.8.7.

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