Hummingbird: Browser Caching is not working properly

Hi,

I deactivated all plugins, only Hummingbird running.
Theme: Twenty Sixteen (same issue with others theme). I have this message when I want to activate Browser Caching:

"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 tried to generate an error in the htaccess, inside the <IfModule mod_expires.c>, and see if my hosting supports mod_expires
Changed this :
# BEGIN WP-HUMMINGBIRD-CACHING

<IfModule mod_expires.c>
ExpiresActive On
ExpiresDefault A0
........

To that:
# BEGIN WP-HUMMINGBIRD-CACHING

<IfModule mod_expires.c>
ExpiresActive On2 <--- changed On into On2
ExpiresDefault A0
..............
I got a Internal Server Error, so I think my server has the "expires" module enabled. Of course I reverted to the original htaccess generated by Hummingbird after checking that

Can you replicate the issue on your side?

Kind regards,
Frank