我有一個歡迎消息機器人，它會在每次有人加入時發送歡迎消息，但有時，它會在控制臺中拋出一條錯誤消息：    member.guild.channels.cache.find(ch => ch.name === "?????????").send(exampleEmbed).catch(e => co    nsole.error(`Welcome Error in ${message.guild.name}`) | message.channel.send("__**ERROR:**__ ** Someone joined the server but I was le to catch it.**"));                                                                   ^TypeError: Cannot read property 'send' of undefined代碼：client.on('guildMemberAdd', member => {    const exampleEmbed = new Discord.MessageEmbed()        .setColor('RANDOM')        .setTitle(`Welcome to lovell <$, **${member.user.username}**`)        .setImage('https://images-ext-1.discordapp.net/external/Gy-micqoX7qrlivnytbmFgfTbxPx_CSvgChFLE3qC7g/https/media.discordapp.net/attachments/755425128635957348/758525058934767617/HaxzUWa46sK5CXKzIR.gif')        .setFooter('Boost Us');    member.guild.channels.cache.find(ch => ch.name === "?????????").send(exampleEmbed).catch(e => console.error(`Welcome Error in ${message.guild.name}`) | message.channel.send("__**ERROR:**__ ** Someone joined the server but I was unable to catch it.**"));})我將如何解決這個問題？