Add a error message if it is unable to fetch prices

include/class-monero-gateway.php

@@ -1,7 +1,7 @@
 <?php
 /*
  * Main Gateway of Monero using either a local daemon or the explorer
- * Authors: Serhack, cryptochangements, mosu-forge
+ * Authors: SerHack, cryptochangements, mosu-forge
  */
 
 defined( 'ABSPATH' ) || exit;
@@ -280,6 +280,9 @@ class Monero_Gateway extends WC_Payment_Gateway
                 $wpdb->query($query);
             }
         }
+        else{
+             self::$log->add('Monero_Payments', "[ERROR] Unable to fetch prices from cryptocompare.com.");
+        }
 
         // Get current network/wallet height
         if(self::$confirm_type == 'monero-wallet-rpc')