Ruby on Rails

I'm trying to put Spree 0.30.1 on Heroku and I'm getting the following
error message (from the heroku logs);

NameError (undefined local variable or method 'auth_user' for
#<ProductsController:0x2b4ee9fb07f8>):

I've tried Google and the Spree Google Group but I'm no nearer to an
answer. Can anyone point me in the right direction
(or any direction)?

Ewen

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