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Chapter 6 Dependency Injection not working

I’m getting an error on the init injection dependency. Here’s the code in having problem with
init(keyboardHandler: KeyboardFollower) {
self.keyboardhandler = keyboardhandler
}
And the error is
‘self’ used before all stored properties are initialized
There is a red underline under the equal sign.

Oh. I guess I should say that this is in Chapter 6

Is keyboardhandler supposed to be the same as keyboardHandler?