Issue creating theme: error displaying template

Hi there, I hope you can help me.

Im redesigning my website from a basic html. This time as well as making it much more modern in general I want to integrate wordpress into it as a cmd. I have been following the themeshaper tutorial to develop my own theme and enable me to get my head around how the whole thing goes together. heres a link to the tut: http://themeshaper.com/2012/10/22/the-themeshaper-wordpress-theme-tutorial-2nd-edition/

Anyway, although I have been finding the proccess of going through this tutorial very informative when I try to view my site via xampp I keep getting the same error message:

Fatal error: Call to undefined function shape_content_nav() in C:\xampp\htdocs\wordpress\wp-content\themes\langdaleview\index.php on line 23

Right, before I go any further I’l post a link to a public file on dropbox that contains all the files in my site so that all code can be viewed:

https://www.dropbox.com/sh/u192bu7yfkcyxz8/wNFgG2_sW5

So clearly, this error is refering to a function which is defined in the template-tags.php file on line 71

and template-tags.php is linked to within the functions.php file on line 32

The odd thing is that, I thought I solved this problem a couple of days ago; whilst I was going through the code in functions.php I noticed that I had left out the code from lines 29-33, which in my mind would be the route of the problem. However, after solving this issue the error message remained and has me completely stumped.

I have since been through the tutorial two or three times ensuring that I have included all the code detailed within the tutorial and to be honest it all seems to be there; so I can’t see what the problem is.

I’m pretty sure that I have missed something obvious being a noob, so any input will be greatly obliged. Thankyou in advance my friends.

Dave B