WP E-Commerce FATAL ERROR

My Site is https://www.catchware.com and uses a custom theme designed by a WP Developer.
Its Running Worpress 4.0
I have Gold cart 2.9.7.1 and I am trying to update WP E-Commerce Plugin to version 3.8.14.3 and get this error:

Fatal error: Call to undefined function wpsc_get_customer_meta() in /home/catchwar/public_html/wp-content/plugins/gold-cart-plugin-2.9.7.1/gold_shopping_cart.php on line 107

This is the code from the referenced file:

* View mode.
	 */
	function wpsc_gc_view_mode() {
		global $wpsc_gc_view_mode;

		$wpsc_gc_view_mode = wpsc_get_customer_meta( 'display_type' );
		if ( empty( $wpsc_gc_view_mode ) )
			$wpsc_gc_view_mode =  wpsc_check_display_type();

		if ( get_option( 'show_search' ) && get_option( 'show_advanced_search' ) ) {
			if ( ! empty( $_REQUEST['view_type'] ) && in_array( $_REQUEST['view_type'], array( 'list', 'grid', 'default' ) ) ) {
				$wpsc_gc_view_mode = $_REQUEST['view_type'];
				wpsc_update_customer_meta( 'display_type', $wpsc_gc_view_mode );
			} elseif ( empty( $wpsc_gc_view_mode ) ) {
				$wpsc_gc_view_mode = get_option( 'product_view', 'default' );
			}
		}

		if ( $wpsc_gc_view_mode == 'grid' ) {
			add_action( 'wp_head', 'wpsc_grid_custom_styles', 9 );
		}
	}

	/**

Any help is greatly appreciated.