diff --git a/telethon/client/auth.py b/telethon/client/auth.py
index 57aabe0c..fab9d41d 100644
--- a/telethon/client/auth.py
+++ b/telethon/client/auth.py
@@ -233,7 +233,7 @@ class AuthMethods(MessageParseMethods, UserMethods):
 
         phone_hash = phone_hash or self._phone_code_hash.get(phone, None)
         if not phone_hash:
-            raise ValueError('You also need to provide a phone_hash.')
+            raise ValueError('You also need to provide a phone_code_hash.')
 
         return phone, phone_hash
 
diff --git a/telethon/client/users.py b/telethon/client/users.py
index 1779647e..2b0cc220 100644
--- a/telethon/client/users.py
+++ b/telethon/client/users.py
@@ -60,10 +60,13 @@ class UserMethods(TelegramBaseClient):
                     result = await future
                     self.session.process_entities(result)
                     return result
-            except (errors.ServerError, errors.RpcCallFailError) as e:
+            except (errors.ServerError, errors.RpcCallFailError,
+                    errors.RpcMcgetFailError) as e:
                 self._log[__name__].warning(
                     'Telegram is having internal issues %s: %s',
                     e.__class__.__name__, e)
+
+                await asyncio.sleep(2)
             except (errors.FloodWaitError, errors.FloodTestPhoneWaitError) as e:
                 if utils.is_list_like(request):
                     request = request[request_index]