Remove invalid error inits and move bad msg error

telethon/errors/common.py

@@ -90,6 +90,53 @@ class AlreadyInConversationError(Exception):
         )
 
 
+class BadMessageError(Exception):
+    """Occurs when handling a bad_message_notification."""
+    ErrorMessages = {
+        16:
+        'msg_id too low (most likely, client time is wrong it would be '
+        'worthwhile to synchronize it using msg_id notifications and re-send '
+        'the original message with the "correct" msg_id or wrap it in a '
+        'container with a new msg_id if the original message had waited too '
+        'long on the client to be transmitted).',
+        17:
+        'msg_id too high (similar to the previous case, the client time has '
+        'to be synchronized, and the message re-sent with the correct msg_id).',
+        18:
+        'Incorrect two lower order msg_id bits (the server expects client '
+        'message msg_id to be divisible by 4).',
+        19:
+        'Container msg_id is the same as msg_id of a previously received '
+        'message (this must never happen).',
+        20:
+        'Message too old, and it cannot be verified whether the server has '
+        'received a message with this msg_id or not.',
+        32:
+        'msg_seqno too low (the server has already received a message with a '
+        'lower msg_id but with either a higher or an equal and odd seqno).',
+        33:
+        'msg_seqno too high (similarly, there is a message with a higher '
+        'msg_id but with either a lower or an equal and odd seqno).',
+        34:
+        'An even msg_seqno expected (irrelevant message), but odd received.',
+        35:
+        'Odd msg_seqno expected (relevant message), but even received.',
+        48:
+        'Incorrect server salt (in this case, the bad_server_salt response '
+        'is received with the correct salt, and the message is to be re-sent '
+        'with it).',
+        64:
+        'Invalid container.'
+    }
+
+    def __init__(self, request, code):
+        super().__init__(request, self.ErrorMessages.get(
+            code,
+            'Unknown error code (this should not happen): {}.'.format(code)))
+
+        self.code = code
+
+
 class MultiError(Exception):
     """Exception container for multiple `TLRequest`'s."""