your purge command is really bad quick hold this

UtilityModule.cs

public class UtilityModule : ModuleBase
{
    [Command("purge")]
    [Alias("clean", "cleanup", "prune")]
    [Summary("Cleans the bot's messages")]
    [RequirePermission(ChannelPermission.ManageMessages)]
    public async Task Clean(
        [Summary("The optional number of messages to delete; defaults to 10")] int count = 10,
        [Summary("The type of messages to delete - Self, Bot, or All")] DeleteType deleteType = DeleteType.Self,
        [Summary("The strategy to delete messages - BulkDelete or Manual")] DeleteStrategy deleteStrategy = DeleteStrategy.BulkDelete)
    {
        int index = 0;
        var deleteMessages = new List<IMessage>(count);
        var messages = Context.Channel.GetMessagesAsync();
        await messages.ForEachAsync(async m =>
        {
            IEnumerable<IMessage> delete = null;
            if (deleteType == DeleteType.Self)
            delete = m.Where(msg => msg.Author.Id == Context.Client.CurrentUser.Id);
            else if (deleteType == DeleteType.Bot)
            delete = m.Where(msg => msg.Author.IsBot);
            else if (deleteType == DeleteType.All)
            delete = m;

            foreach (var msg in delete.OrderByDescending(msg => msg.Timestamp))
            {
                if (index >= count) { await EndClean(deleteMessages, deleteStrategy); return; }
                deleteMessages.Add(msg);
                index++;
            }
            });
    }

    internal async Task EndClean(IEnumerable<IMessage> messages, DeleteStrategy strategy)
    {
        if (strategy == DeleteStrategy.BulkDelete)
        await Context.Channel.DeleteMessagesAsync(messages);
        else if (strategy == DeleteStrategy.Manual)
        {
            foreach (var msg in messages.Cast<IUserMessage>())
            {
                await msg.DeleteAsync();
            }
        }
    }
}

public enum DeleteType
{
    Self = 0,
    Bot = 1,
    All = 2
}

public enum DeleteStrategy
{
    BulkDelete = 0,
    Manual = 1,
}

Here