Have you installed Cu2 for ConifgMgr 2012 Sp1? If so you might see a error when installing a Secondary Site. This problem has been document in the forrum
Microsoft has released a blog detailing the work around for the post
CU2 for ConfigMgr 20 12 SP1 problem while adding a Secondary site.
Microsoft is investigating but as a workaround here is what you can do to get
around the issue.
One way is to use a network location of the secondary
install files. The second method was created by one of the MVP and
details changing out XML files from the initial Sp1 installation media.
Once I have more information I will email everyone, I will
also try to update my blog with the information as well.
---
update.
Microsoft has released a hotfix to fix the issue:
http://support.microsoft.com/kb/2867422
FIX: Errors when you try to install or recover a secondary site in System Center 2012 Configuration Manager