Declaration of ExtendAssociationsBehavior::setup() should be compatible with ModelBehavior::setup(Model $model, $config = Array)

I want to put a newsletter in my website and I am using the following plugin:

https://github.com/edap/cakephp-newsletter-plugin

I already followed these steps:

Step 1: http://iandeth.dyndns.org/mt/ian/archives/20120110-cakephp-extendassociations-behavior/ExtendAssociations2Behavior.txt save it under Models/Behavior/ExtendAssociationsBehavior.php

I am getting the following error:

Declaration of ExtendAssociationsBehavior::setup() should be compatible with ModelBehavior::setup(Model $model, $config = Array)

How to solve this error

How do I enable Newsletter Plugin for cakephp

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