Hi, I am Using Ubuntu 20 LTS and Nginx

Hi, I am Using Ubuntu 20 LTS and Nginx and my Sitemap is not showing. Your Plugin is Saying to Paste a code in nginx Config File. But after pasting that code in config file the Nginx Show the Following Error:

nginx: [emerg] “rewrite” directive is not allowed here in /etc/nginx/nginx.conf:103
nginx: configuration file /etc/nginx/nginx.conf test failed

Now kindly Guide me what i have to do.
I am waiting for your Response.
Thanks.