Issue loading rails 3 (server) after coming back from 3.1

Question

total noob to rails and am using the Hartl tutorial.

Got to chapter 4 (CSS, 4.1.2), everything seemed dandy, and ran into an issue getting

Answer 1

im in the same boat as you, i am running rails 3.1.3 and am not in the mood atm to start over for a lower rails (or to figure out how to seamlessly change rails version).

i decided to remove the blueprint folder and its two including lines in application.html.erb, and make a new inclusion of a custom css file i put directly in app/assets/stylesheets. the css was just to make the background red, and thats what it did. not sure why our pages were being centered like that using the blueprint, but it looks okay now. as mentioned earlier, the safest bet is to just use the same versions as the tutorials, or 3.0.11 for rails as mr. hartl has indicated in a comment.