RPC Errors

RPC stands for Remote Procedure Call, and when the library raises a RPCError, it’s because you have invoked some of the API methods incorrectly (wrong parameters, wrong permissions, or even something went wrong on Telegram’s server). All the errors are available in API Errors, but some examples are:

  • FloodWaitError (420), the same request was repeated many times. Must wait .seconds (you can access this attribute). For example:

    from telethon import errors
        messages = await client.get_messages(chat)
    except errors.FloodWaitError as e:
        print('Have to sleep', e.seconds, 'seconds')
  • SessionPasswordNeededError, if you have setup two-steps verification on Telegram.

  • CdnFileTamperedError, if the media you were trying to download from a CDN has been altered.

  • ChatAdminRequiredError, you don’t have permissions to perform said operation on a chat or channel. Try avoiding filters, i.e. when searching messages.

The generic classes for different error codes are:

  • InvalidDCError (303), the request must be repeated on another DC.
  • BadRequestError (400), the request contained errors.
  • UnauthorizedError (401), the user is not authorized yet.
  • ForbiddenError (403), privacy violation error.
  • NotFoundError (404), make sure you’re invoking Request’s!

If the error is not recognised, it will only be an RPCError.

You can refer to all errors from Python through the telethon.errors module. If you don’t know what attributes they have, try printing their dir (like print(dir(e))).

Avoiding Limits

Don’t spam. You won’t get FloodWaitError or your account banned or deleted if you use the library for legit use cases. Make cool tools. Don’t spam! Nobody knows the exact limits for all requests since they depend on a lot of factors, so don’t bother asking.

Still, if you do have a legit use case and still get those errors, the library will automatically sleep when they are smaller than 60 seconds by default. You can set different “auto-sleep” thresholds:

client.flood_sleep_threshold = 0  # Don't auto-sleep
client.flood_sleep_threshold = 24 * 60 * 60  # Sleep always

You can also except it and act as you prefer:

from telethon.errors import FloodWaitError
except FloodWaitError as e:
    print('Flood waited for', e.seconds)

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