Browser tidak suport gd function

saya sedang mencoba library Codeigniter (image_lib), pas saya coba di browser dan hasilnya

The path to the image is not correct.

Your server does not support the GD function required to process this type of image

ini controllernya :

public function image_lib_test() {
		$config['image_library'] = 'gd2';
		$config['source_image'] = 'C:/xampp/htdocs/belajar/assets/images/goo.png';
		$config['create_thumb'] = TRUE;
		$config['maintain_ratio'] = TRUE;
		$config['width']         = 75;
		$config['height']       = 50;

		$this->load->library('image_lib', $config);

		if(! $this->image_lib->resize()) {
			echo $this->image_lib->display_errors();
		} else {
			echo 'bekerja dengan baik';
		}
	}

padahal divideo tutorial yang saya lihat berjalan dengan baik.

tolong dibantu...