Hello guys. I'm having trouble with Image Upload. I have a form with unique field, the image upload. When i click on the button i receive the message "Exception Serialization of 'Symfony\Component\HttpFoundation\File\UploadedFile' is not allowed". The funny thing is that the upload is working, and the image name is going to database

==== Controller ======

protected $layout = 'backend.templates.index';

public function store($id)
{
	$object = PaginaInicial::find($id);
	
	$imagem = Thumb::make('imagem', 280, 650, 'home/', false, '#FFFFFF', true);
	if($imagem) {
		File::delete('assets/images/home/'.$object->imagem);
		$object->imagem = $imagem;
	}
	
	try {
		$object->save();
		Session::flash('sucesso', true);
		Session::flash('mensagem', 'Imagem alterada com sucesso !');
		return Redirect::route('painel.home.index');

	} catch (\Exception $e) {
		Session::flash('formulario', Input::all());
		return Redirect::back()->withErrors(array('Erro ao editar imagem !'));
	}
}

Observation: Thumb is another class created by me.In other projects she presented no problems.