Cannot start nginx due to error: invalid port

I recently updated my Let’s Encrypt certificate. To do so, I had to stop my nginx server. After updating the certficate, I tried starting my nginx server with sudo systemctl start nginx and get this error: nginx: [emerg] invalid port in "[::]:" of the "listen" directive in /etc/nginx/sites-enabled/default:4.

Here is my code for the the default file:

# HTTP — redirect all traffic to HTTPS
server {
    listen 80;
    listen [::]: 80;
    return 301 https://$host$request_uri;
}

# HTTPS — redirects www to non-www
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.atomz.io;

    # Use the Let's Encrypt certificates
    ssl_certificate /etc/letsencrypt/live/atomz.io/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/atomz.io/privkey.pem;

    # Include the SSL configuration from cipherli.st
    include snippets/ssl-params.conf;
    return 301 https://atomz.io$request_uri;
}

# HTTPS — proxy all requests to the Node app
server {
    # Enable HTTP/2
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name atomz.io;

    # Use the Let’s Encrypt certificates
    ssl_certificate /etc/letsencrypt/live/atomz.io/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/atomz.io/privkey.pem;

    # Include the SSL configuration from cipherli.st
    include snippets/ssl-params.conf;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://localhost:3000/;
        proxy_ssl_session_reuse off;
        proxy_set_header Host $http_host;
        proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
    }
}

Thanks for the help!