我已经尝试了我找到的所有代码，但由于某种原因，这不起作用，我不知道为什么。我的代码：

if(message.content.startsWith("!inrole")){
    let roleName = message.content.split(" ").slice(1).join(" ");

    let membersWithRole = message.guild.members.cache.filter(member => { 
        return member.roles.cache.find("name", roleName);
    }).map(member => {
        return member.user.username;
    })

    let embed = new discord.RichEmbed({
        "title": `Membros com o${roleName}`,
        "description": membersWithRole.join("\n"),
        "color": 0xFFFF
    });

    return message.channel.send({embed});
}