Controller does not load automatically models in plugin (Cake 2.7.5)

The title already speaks exactly my problem. 

The controller does not load the standard model in the Plugin. I have to do manually. 

Including adding the word "Model " on the App::uses() , if not does not work.

e.g.: App::uses("ContactModel", "PluginName.Model")

If I insert just App::uses("Contact", "PluginName.Model"), not working.

Can someone help me?

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