Critical Error WordPress site

IN PROGRESS
Bids
14
Avg Bid (AUD)
$61
Project Budget (AUD)
$50 - $200

Project Description:
My website (hunterbabydotcomdotau) is down and I can't access the back end with my login - it doesn't recognise my password which is correct and when I try to reset it it says 'invalid'.

My webpages has the following script in the header:

[14-May-2012 23:53:38] PHP Fatal error: Call to undefined function get_option() in /home/hunterba/public_html/wp-content/plugins/gold_cart_files_plugin/merchants/vmerchant.php on line 10 [14-May-2012 23:57:02] PHP Fatal error: Call to undefined function get_option() in /home/hunterba/public_html/wp-content/plugins/gold_cart_files_plugin/merchants/authorize.merchant.php on line 38 [14-May-2012 23:57:11] PHP Fatal error: Call to undefined function get_option() in /home/hunterba/public_html/wp-content/plugins/gold_cart_files_plugin/merchants/vmerchant.php on line 10

I need to resolve this asap!

Skills required:
Codeigniter, HTML, PHP, Script Install
About the employer:
Verified
Public Clarification Board
Bids are hidden by the project creator. Log in as the employer to view bids or to bid on this project.
You will not be able to bid on this project if you are not qualified in one of the job categories. To see your qualifications click here.