Nginx problem when i enabled the file by linking to the sites-enabled dir

my gorgeous friends on the internet.
I was doing something about Nginx for deploying my app made by Django, Postgresql, Gunicorn, Nginx, and DigitalOcean.
First of all, The project name in the Github gist is btre_project, but my app’s project name is pfc_calc. Considering the name dif, I created project folder by coping and pasting the line on the gist.

sudo nano /etc/nginx/sites-available/pfc_calc

And, copy the code and paste it into the file I just made.

server {
    listen 80;
    server_name 104.248.152.6;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/djangoadmin/pyapps/pfc_calc;
    }
    
    location /media/ {
        root /home/djangoadmin/pyapps/pfc_calc;    
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

BUT, here is where I made a mistake and got an error
I was so foolish that I forgot to change btre_project to pfc_calc

sudo ln -s /etc/nginx/sites-available/btre_project /etc/nginx/sites-enabled

Because I noticed that mistake, I typed this line again.

sudo ln -s /etc/nginx/sites-available/pfc_calc /etc/nginx/sites-enabled

I thought it would be ok and my mistake was under the bridge, but it wouldn’t.
When I typed this line

sudo nginx -t

this error below showed up.

nginx: [emerg] open() "/etc/nginx/sites-enabled/btre_project" failed (2: No such file or directory) in /etc/nginx/nginx.conf:62
nginx: configuration file /etc/nginx/nginx.conf test failed

I think I needed to delete the file I mis-created when I typed

sudo ln -s /etc/nginx/sites-available/btre_project /etc/nginx/sites-enabled

Any help??