If you’re using WP-ecommerce shopping cart and you get a fatal error like:
PHP Fatal error: Call to undefined function get_option() in /home/somestore/public_html/wp-content/plugins/wp-shopping-cart/gold_cart_files/merchants/authorize.php on line 9
PHP Fatal error: Call to undefined function get_option() in /home/somestore/public_html/wp-content/plugins/wp-shopping-cart/gold_cart_files/merchants/paypal_payflowpro.php on line 10
PHP Fatal error: Call to undefined function get_option() in /home/somestore/public_html/wp-content/plugins/wp-shopping-cart/gold_cart_files/merchants/bluepay.php on line 9
Try this simple solution:Look in your gold-cart files and see if there are any files other than:

readme.txt
pxaccess.php
grid_view.old.css
grid_view.css
grid_display_functions.php
gold_shopping_cart.php
gold_options.php
gold_cart_readme.txt
gold_cart.js
gold_cart.css
extra_image_processing.php
arrowdown.gif

And these two folders:
merchants
ewaylib

If there are any other files or folders chances are that getting rid of them will take care of your problem.  Commonly getting rid of an error-log file if it exists in this folder gets rid of the problem.  Sometimes on install people get a gold-cart folder within the gold-cart folder.

The above has worked for me and it has also been noted as a solution on the cart’s developer forum.

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