I cannot get the browser caching section of the Hummingbird plugin to work. It says: "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
If re-checking and restarting does not resolve, please check with your host or open a support ticket with us."
I have re-checked with the same error. Please provide guidance.