Adda serialVersionUID.
@@ -16,6 +16,8 @@ import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
public class Panel extends Canvas implements Receiver<String> {
+ private static final long serialVersionUID = 1884786992301690151L;
+
/** The width of the panel, in characters. */
@Getter private int widthInCharacters;
/** The height of the panel, in characters. */
