Browser Caching is not working properly

Hello,

I tried everything from the suggestions in the support area but still unable to solve te problem bellow:

Browser Caching is not working properly:
- Your server may not have the "expires" module enabled (mod_expires for Apache, ngx_http_headers_module for NGINX)
- Another plugin may be interfering with the configuration

Any help is welcome.
Thank you.

Best regards,
Valentin