PHP Error: Call to undefined method stdClass::save()

I have a model that throws the above error. I created a seeder for this model that doesn't seem to run (other seeders in the folder run). The model is below..

<?php
namespace App;

use Illuminate\Database\Eloquent\Model;

class Perms extends Model
{

    protected $fillable = ['name'];


    public function roles() {
        return $this->belongsToMany(Role::class,'roles_permissions');
     }
}

in tinker I do..

$p = new \App\Perms();
$p->name = 'test';
$p->save();

PHP Error:  Call to undefined method stdClass::save()