Joomla! Template 002057 - Item Support

I have a blank page when ;loading the home page. there are no errors. so I don't even know where to start looking here. I have bought the full template.
Hi Just to be a little more clear on the template issues i am having I am receiving this error when I look at the source code on page load.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<br />
<b>Fatal error</b>: Using $this when not in object context in <b>/home/cbaircons/public_html/index.php</b> on line <b>3</b><br />
Hello BRADLEYC,
Just checked your site, it looks fine, have you managed to resolve your problem, what was the issue?

Regards, AS Team.
Item Name:
002057
Author:
Downloads:
17998
Sales:
1795
Created:
2013-11-15
Updated:
2023-03-06
Item Version:
4.0.0
Supported Joomla:
Joomla 5 Product
$29.00
Regular License
This item may be used for a single domain only.
$39.00
Extended License

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