CI can't find my method and I don't know why...

Because this is not how you use models.
Method "model" of CI_Loader returns an instance of it self(CI_Loader), not an instance of the model. The model is instantiated in the controller property with the same name as the model, or in coder words: $this->Nameofmodel_model

Please read:
http://www.codeigniter.com/user_guide/ge...ng-a-model

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