Unable to Install Two DC on Same Domain

I am trying to install 2 DC’s on a same domain for education reason. For the very first DC, everything went quite smoothly but when I tried to get done with the second DC, it results me with the following error message.

Active Directory Domain Services Installation Wizard
An active Directory domain controller for the domain globomantics .com could not be contacted.
Ensure that the DNS domain name is type correctly.
If name is correct, then click Details for troubleshooting information.
