Help with C# code

Hello!
I have recently started working with Unity, and I can't seem to get passed this part.

http://pastebin.com/bPkJ6tkr

It's supposed to end the game when you touch any Object with wall in it's name (aka, Left Wall, South Wall, Third Wall, all of the things similar to that.), but it keeps giving me errors I can not solve about the code.
The moving part is working properly, and there's no errors on that side.

It is probably a very stupid thing I missed, but I couldn't figure it out myself so figured I should ask the people here.
Thanks for your reading/helping!

 

Your code looks perfectly fine. What are the error messages you're getting?

 

Okay wow.. The errors just disappeared.
Sadly though, the game still doesn't restart when I hit the objects "North, East, South & West Wall"

 

Are your walls marked with a tag named "Wall"? And do you have your scene added to the "Scenes in build" section of the "Build Settings" dialog?

 

How do I tag them and how do I add them to the scenes in build?
I thought "contains" just checked if the title of the object contained those words.

 

It does check to ensure it contains it, in your case it would be case-sensitive, you can add tags however by following the instructions here: http://docs.unity3d.com/Manual/class-TagManager.html

Then adjust the tag through the inspector for the various walls(or just do it to the prefab).