In Personal File Sharing menu I am getting this. I want to enable this. Here, what should I do ?

In Personal File Sharing menu I am getting this. I want to enable this. Here, what should I do ?

Use
sudo apt-get install apache2
This solution has been provided from Share Files over the Network - What packages?
I got the same issue on my Ubuntu 16.04 LTS and I fixed it
Install the following
sudo apt-get install apache2-bin libapache2-mod-dnssd
and restart Personal File Sharing and enable sharing over the network.
Then, to share a folder, right-click and choose properties. Then use the Local Network Share tab to share it.
You should now be able to browse your network using Nautilus and mount this folder from other Ubuntu machines, but not from Windows machines.
I tested this on Ubuntu 17.04