Telethon/readthedocs/extra/troubleshooting/rpc-errors.rst

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==========
RPC Errors
==========
RPC stands for Remote Procedure Call, and when Telethon raises an
``RPCError``, it's most likely because you have invoked some of the API
methods incorrectly (wrong parameters, wrong permissions, or even
something went wrong on Telegram's server). The most common are:
- ``FloodWaitError`` (420), the same request was repeated many times.
Must wait ``.seconds`` (you can access this parameter).
- ``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``.