It should be:

module.exports = {
    name: 'ban',
    description: "This command bans people",
    execute(message, args) {

        if(message.member.roles.cache.has('923203237019004958')) {
            const member = message.mentions.members.first();
            if(member) {
                const memberTarger = message.guild.members.cache.get(member.id);
                memberTarger.ban();
                message.channel.send("User has been banned from the paper bag");
            }
            else {
                message.channel.send("You don't have the sufficent permissions to run this command")
            }
        }

    }
}

There was a closing bracket } next to the execute(message, args) but it should be an opening bracket {