GZIP compression not working on Multisite

Hi,

I am getting the following error message after activating the compression on Hummingbird. I also tried copy pasting the GZIP compression code into the htaccess file. Same error code.

Trying to improve JS and CSS but I won't get it enabled with Hummingbird..

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.

I am using a multisite in three languages and i have already tried improving js and css compression with different plugin such as autoptimize, super cache, w3 total cache (doesnt work on multisites) . So far no luck...

Anybody can help me out with optimizing pagespeed?

thanks