Fix dupplicate error message issue 24007

Author: edenduong

app/code/Magento/Directory/Model/Currency/Import/CurrencyConverterApi.php

@@ -103,7 +103,9 @@ private function convertBatch($data, $currencyFrom, $currenciesTo)
                         $data[$currencyFrom][$to] = null;
                     } else {
                         if (isset($response['error']) && $response['error']) {
-                            $this->_messages[] = $response['error'];
+                            if (!in_array($response['error'], $this->_messages)) {
+                                $this->_messages[] = $response['error'];
+                            }
                             $data[$currencyFrom][$to] = null;
                         } else {
                             $data[$currencyFrom][$to] = $this->_numberFormat(