When you have troubles with your network connection, sometimes you'll be sent to the "Error World". And if you try to go to another world instance, you'll see an error dialog. The body message of the dialog is
35400
World is incompatible with current platform.
This doesn't describe what is happening at all. And it doesn't help or guide the user. It should tell restarting the app. This should be rephrased. Or a dedicated new string might be needed for this use case.
(This seems to happen when the app loses the network connection over a certain period of time, it logs out "Missing Credentials" errors. So I titled this post so.)