i was coding my welcome message on my discord bot, but when someone enters in the server, console give me this error:

TypeError: Cannot read properties of undefined (reading 'cache')

here is my guildMemberAdd.js code:

const { MessageEmbed } = require('discord.js');



module.exports = {

name: "guildMemberAdd",

execute(member) {

    const MemberRole = member.guild.roles.cache.get('891716789879316540');

    member.roles.add(MemberRole);

    

    const WelcomeEmbed = new MessageEmbed()

    .setColor('RANDOM')

    .setAuthor('WELCOME', member.user.displayAvatarURL({dynamic: true}))

    .setDescription(`Welcome ${member} in our server!n you are the number ${member.guild.memberCount}`)

    .setFooter(`${member.user.tag}`, member.user.displayAvatarURL({dynamic: true}))

    .setTimestamp();

    member.guild.channel.cache.get('768526997882142743').send({content: `${member}`, embeds: [WelcomeEmbed]});



    const LogEmbed = new MessageEmbed()

    .setColor('GREEN')

    .setDescription(`${member} came in our server`)

    .setTimestamp();



    member.guild.channel.cache.get('768526997882142743').send({embeds: [LogEmbed]});

    }

}

the strange thing is that on the 6th line it works fine, but in the 15th line and in the 22th doesn't works