Getting error while adding host=-only server in virtual box. [ E_INVALIDARG (0x80070057) ]

I need to create a new Host-only network, in VirtualBox, as a part of this tutorial to learn Puppet tool. I went to File -> Preferences -> Network -> Host-only network, and clicked on "Add host-only network". On clicking ok, it generated default values of DHCP as 0, in the end (screesnshots below). Which gave the following error:

Failed to save the settings.

Invalid server address.

Result Code: E_INVALIDARG (0x80070057)
Component: VirtualBoxWrap
Interface: IVirtualBox {0169423f-46b4-cde9-91af-1e9d5b6cd945}
Callee: IDHCPServer {00c8f974-92c5-44a1-8f3f-702469fdd04b}

• adapter
• dhcp server (the address values are generated by default)
• error

How should I configure DHCP? so my host-only network is created?

Your DHCP server address values do not appear to be the defaults. Are you sure you didn't change something?

The values I see in there by default match those in the Youtube video and they are:

In your screenshot, you have

• Server Address: 192.168.115.0
• Server Mask: 255.255.255.0
• Lower Address Bound: 192.168.115.0
• Upper Address Bound: 192.168.115.0

That lower/upper address bound are outside of the network specified in Address/Subnet so it is invalid. See here in the VirtualBox docs for the meaning of lower and upper address bound.

Try using ipcalc to calculate valid settings:

$ ipcalc 192.168.115.0/255.255.255.0
Address:   192.168.115.0        11000000.10101000.01110011. 00000000
Netmask:   255.255.255.0 = 24   11111111.11111111.11111111. 00000000
Wildcard:  0.0.0.255            00000000.00000000.00000000. 11111111
=>
Network:   192.168.115.0/24     11000000.10101000.01110011. 00000000
HostMin:   192.168.115.1        11000000.10101000.01110011. 00000001
HostMax:   192.168.115.254      11000000.10101000.01110011. 11111110
Broadcast: 192.168.115.255      11000000.10101000.01110011. 11111111
Hosts/Net: 254                   Class C, Private Internet

You can use HostMin and HostMax for your Lower and Upper Address Bound respectively.

Hope that helps.