extendClass was never called on Error

[Dannymh]

I have an addon that consists of a template, a template modification and 3 entitties. One of the entities is a user entity which extends the XF user entity.
This all works fine on my dev server, once I move it over and try to install it on the production server, it throws the following error '




Code:

An exception occurred: [LogicException] Tried to call XF\Extension::resolveExtendedClassToRoot on Onthebox\Ident\Entity\User, but extendClass was never called on the base class in src/XF/Extension.php on...

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extendClass was never called on Error

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