This tends to happen on PC for addons that are outdated and/or interfering with the game's UI. For Console it often happens for frequent input, suggesting issues with controllers or keyboards.
Please try either updating your addons or disabling them and trying the area again. If this is still causing an issue, while addons are disabled, try running a Repair on the game and continuing.
If you're still having issues SUPPORT may have other suggestions. Just make sure they're aware of any steps you've tried ahead of time.
Just wanted to add that this is a badly-worded error. The "message rate limit" does not refer to chat messages, but rather to "messages" sent between the client and the server. It often occurs during periods of high latency, when you input a load of commands but nothing happens. Your stack of commands, or "messages", are then all sent to the server at once.