Relationship Error with model_type do not have a default value type

[bensonarafat]

Error when I add a relationship to my model
Like this.
something like this

use DGvai\Review\Review;
use DGvai\Review\Reviewable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Bootcamp extends Model
{
    use Reviewable;
    use HasFactory;

    public function reviews(): HasMany
    {
        return $this->hasMany(Review::class, 'model_id')->with('user')->active();
    }

so if i remove the model class if works fine