WP_Image_Editor_Imagick::pdf_setup(): string|WP_Error

1330	protected function pdf_setup() {1331		try {1332			/*1333			 * By default, PDFs are rendered in a very low resolution.1334			 * We want the thumbnail to be readable, so increase the rendering DPI.1335			 */1336			$this->image->setResolution( 128, 128 );1337 1338			// Only load the first page.1339			return $this->file . '[0]';1340		} catch ( Exception $e ) {1341			return new WP_Error( 'pdf_setup_failed', $e->getMessage(), $this->file );1342		}1343	}