我正在使用 discord.js 來制作一個不和諧的機器人。我不斷收到控制臺錯誤“無法讀取未定義的屬性'startsWith'”我將如何解決這個問題？這是代碼片段if(Discord.Message.content.startsWith('>ban')){        if(Discord.Message.member.guild.me.hasPermission('BAN_MEMBERS'))        {            if(Discord.Message.mentions.members.first())             {                Discord.Message.mentions.members.first.ban().then((member) => {                    Discord.Message.channel.send("**BANNED** " + member.displayName + " has been banned:hammer:");                }).catch(()=> {                    Discord.Message.channel.send("You do not have permission to ban that user... If you think this is an issue, please contact a server administrator");                })            }        }    }