Help me find the bug that is causing my SiteCake website not to work

General information for the website: HTML5 website for Small Beauty Business
Description of requirements/features: I need someone with more experience in de-bugging to tell me why my website CMS control panel keeps crashing. It's built using a CMS called SiteCake (http://sitecake.com/) and it keeps finding an error, making it unusable. It's not attached to a database, as it's a 'light cms'. I also need it up and running as soon as possible.

This is the website: http://www.peacockcreativedesign.co.uk/development/aviemore-beauty/index.php

This is the error (screenshot also attached)

Uncaught exception: java.lang.NumberFormatException: For input string: "auto" at Unknown.lxc(Unknown source:0) at Unknown.vvc(Unknown source:0) at Unknown.ROb(Unknown source:0) at Unknown.vPb(Unknown source:0) at Unknown.rxb(Unknown source:0) at Unknown.bxb(Unknown source:0) at Unknown.ntb(Unknown source:0)

I am also on the lookout for a developer in the local area (UK or Scotland) that I can work with on a more regular basis
www.peacockcreativedesign.co.uk
https://www.facebook.com/PeacockCreativeDesign