[Hummingbird Pro] What plugins are usually suspect with the Hummingbird Pro Caching Plugin?

I’m trying to use the Hummingbird Pro Caching Plugin and it returns these errors:

It says: Browser Caching plugin is not working properly:
– Your server may not have the “expires” module enabled (mod_expires for Apache, ngx_http_headers_module for NGINX)
Or – Another plugin may be interfering with the configuration

Response from the host:
The expires module is already enabled on the server. You can verify the same from the following.
[root@webhosting2030 ~]# httpd -M | grep expires
expires_module (shared)

What plugins do others report that break Hummingbird Pro Caching Plugin