set error code

app/Libs/Zimbra/Components/Api/Soap/Services/Create/CreateAccountAlias.php

@@ -68,7 +68,7 @@ class CreateAccountAlias extends ApiService
          */
         if(!$result)
         {
-            $this->setError($this->api->account->getError());
+            $this->setError($this->api->account->getLastResult()->getLastErrorCode());
             return false;
         }