who can help me to edit InventoryAndStashPlugin.cs for glq?

[lengyue0130]

if change
using System;
using System.Globalization;
using System.Linq;
using Turbo.Plugins.Default;

namespace Turbo.Plugins.glq
{
public class GLQ_InventoryAndStashPlugin : BasePlugin, IInGameTopPainter
the log is GLQ_InventoryAndStashPlugin.cs': possibly trying to use System.Diagnostics.

if del using System.Globalization; the log is GLQ_InventoryAndStashPlugin.cs(36,16) : error CS1520: Method must have a return type

who can tell me why? or help me edit InventoryAndStashPlugin.cs