I’m trying to count members of specific role but i’m getting error, message.guild.fetchMembers() is not a function

    let guild = await message.guild.fetchMembers();
    let roleID = '3933783737379';
    let memberCount = guild.roles.get(roleID).members.size;
    message.channel.send(memberCount + " members have this role!");
});

So if i just delete guild variable to make the code the code like this

let roleID = '3933783737379';
    let memberCount = message.guild.roles.get(roleID).members.size;
    message.channel.send(memberCount + " members have this role!");

He will count him self if he has it and count the owner only no one else counted

Is there any idea how to make this work?