Error SC0103 The name Language does note exist in the current context warnings

using Terraria.ID;
using Terraria.ModLoader;
using Terraria;
namespace AwesomeModChains.Items
{
public class a : ModItem
{
public override void SetStaticDefaults()
{
// DisplayName.SetDefault("a"); // By default, capitalization in classnames will add spaces to the display name. You can customize the display name here by uncommenting this line.
Tooltip.SetDefault("This is a basic modded sword.");
}

public override void SetDefaults()
{
item.damage = 50;
item.melee =...

Error SC0103 The name Language does note exist in the current context warnings