Multiple implicit model binding with one controller in Laravel

I am trying to attach multiple models with one controller using implicit model binding but I am getting the following error if I try to attach more than one model with methods.

index() must be an instance of App\\Http\\Models\\Modelname, string given

Here is my code:

public function index(Model1 $model1,Model2 $model2,Model3 $model3)
{
    print_r($application_endpoint);
}

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