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What causes this error?

I suddenly started getting this error whenever the server-side extension tries to send a message to the client. Can somebody please explain what can cause this cryptic error? Is it permissions? Something wrong with the zone? The plugin?

(In case it matters, this is a zone extension, there is no room extension.)

00:09:25,017 WARN [com.smartfoxserver.v2.controllers.ExtensionController-1] controllers.ExtensionController -
com.smartfoxserver.v2.exceptions.SFSExtensionException: No extensions can be invoked: { Zone: Gorgon }, RoomId: None
com.smartfoxserver.v2.controllers.ExtensionController.processRequest(ExtensionController.java:120)
com.smartfoxserver.bitswarm.controllers.AbstractController.run(AbstractController.java:96)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)

Ah I found it: the zone didn't initialize correctly for some reason.

(Bizarrely, SFS2X is still calling all the event handlers on the extension, even though it says "Extension initialization failed".)