gzip is not working properly

Hi, trying to enable compression and getting the following error:
***gzip is not working properly:
- Your server may not have the "deflate" module enabled (mod_deflate for Apache, ngx_http_gzip_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.***

htaccess writeable and gzip enabled on site.