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+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:
+
+* `FloodError` (420), the same request was repeated many times. Must wait `.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``.
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