I saw this error for the first time and don't really know what to do about it. 
When I tried to register a new user on my website and when I clicked on submit button it shows:

> 
> FatalErrorException in User.php line 11:
>  Class App\User contains 6 abstract methods and must therefore be declared abstract or implement the remaining methods (Illuminate\Contracts\Auth\Authenticatable::getAuthIdentifierName, Illuminate\Contracts\Auth\Authenticatable::getAuthIdentifier, Illuminate\Contracts\Auth\Authenticatable::getAuthPassword, ...)
> 
> 
> 

**User Model:**

```
<?php 
namespace App;
use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;

class User extends Model implements Authenticatable
{
protected $table = 'users';
protected $primaryKey = 'id';   
}

```

What is it trying to say, I don't understand. Please can someone help me with this?