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I''ve posted a different question just before -- but before I can try and get a better idea of my error message, I was trying to start my application and ran into other problems. My application was developed last year in rails 1.2.3. I since upgraded my computer and have the latest version of rails. When I tried to star the application I got the following error message:

This might seem really simple to some but just wanted to ask: what is the difference between @session[''user''] and session[:user] ? and how would you use each? And another question, I have the following code: def get_customer if @session[''customer''] @c = Customer.find(@session[''customer'']) end end private def