Why I get Non-static method should not be called statically?

I'm learning Laravel and the way I learn a new framework is going deep and found how/why magic happened in that. So I learn facades and love them and wanna found how Laravel do the magic and found a way to have similar feature is __callStatic magic method. and here is my code :

class Facade {
  public static function __callStatic($method,$args){
    $instance = static::getFacade();
    return call_user_func_array([$instance, $method], $args);
  }

}


class DB extends Facade {
  public static function getFacade(){
    return new self();
  }

  public function init(){
    echo 'INIT DB';
  }
}


DB::init();

the code has a right output but I get this error:

Non-static method DB::init() should not be called statically :21

I don't understand why I got this and also Why I don't get this error in Laravel application that does this.

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