Can't access admin/sign-in

[Cyndi]

Tried uploading backup copy of shop after installing B1G1 free module, which didn't work. Store "front" is appearing but I can't get in the back end. Any help appreciated,.

Error log says:
[13-Sep-2011 07:48:20] PHP Fatal error: Cannot redeclare zen_update_products_price_sorter() (previously declared in /home/sprinks/public_html/shop/zc_admin/includes/functions/general.php:2680) in /home/sprinks/public_html/shop/zc_admin/includes/functions/functions_prices.php on line 1334

And this is line 1325 to 1334 in functions_prices.php:

// set the products_price_sorter
  function zen_update_products_price_sorter($product_id) {
    global $db;

    $products_price_sorter = zen_get_products_actual_price($product_id);

    $db->Execute("update " . TABLE_PRODUCTS . " set
                  products_price_sorter='" . zen_db_prepare_input($products_price_sorter) . "'
                  where products_id='" . (int)$product_id . "'");
  }