Laravel 5.4 : Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation

I am using Laravel 5.4 .There are two tables groups and contacts with the following structure. Every contact has a group.

contacts

groups

I also created a model for each one as below:

Group.php which is the groups model

namespace App;

use Illuminate\Database\Eloquent\Model;

class Group extends Model
{
    public function contact()
    {
        return $this->hasMany('App\Contact');
    }
}

Contact.php which is the contacts model

namespace App;

use Illuminate\Database\Eloquent\Model;

class Contact extends Model
{
    public function group(){
        $this->belongsTo('App\Group');
    }
}

Now using the php atrisan tinker, the following command reports the error:

App\Contact::find(3)->group 

When I type App\Contact::find(3) it returns the contact with ID 3 successfully but the App\Contact::find(3)->group returns the error while I expect it to return the group of contact with ID 3

Thanks.

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