TypeError: Cannot read property 'users' of undefined

I was trying to make a const member but it says "TypeError: Cannot read property 'users' of undefined"

module.exports = {
    name: 'welcome',
    description: 'welcome',
    execute(message, args, Discord) {

        const member = message.mentions.users.first();

        if(message.member.permissions.has('ADMINISTRATOR')){
            message.channel.send(
                new MessageEmbed()
                .setTitle('title')
                .setImage('imageurl')
                .setDescription('desc')
            )
        }else{
            return message.channel.send(`You don't have any permissions to do that!`)
        }
    }
}

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