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Solved-The schema is not upgraded in Windows Server 2012

This is the detail of the error message in adprep log file

Adprep failed to verify whether schema master has completed a replication cycle after last reboot.
[Status/Consequence]
The schema is not upgraded.
[User Action]
Check the log file ADPrep.log in the C:\Windows\debug\adprep\logs\20130613165022-test directory for possible cause of failure.
[2013/06/13:16:50:22.392]
Adprep encountered an LDAP error.
Error code: 0xc. Server extended error code: 0x20ae, Server error message: 000020AE: SvcErr: DSID-03210384, problem 5010 (UNAVAIL_EXTENSION), data 8610
My domain scenario is that I have main domain controller on Windows Server 2008 R2 (DC1) and a backup domain controller on Windows Server 2008 (DC2), I am upgrading my company’s domain controller to server 2012 and for this i installed windows server 2012 on one of my machine in a Hyper-V role and wanted to make it as another backup domain controller before making further up gradation. But it was failing on pre-requisite checks with the error  mentioned above. Actually this Error was caused because of my silly mistake, but thought to share for silly guys like me, lol…
And the mistake was my backup domain controller (the server with Windows 2008) was turned off. Started the backup domain controller with the main domain controller and after that pre-requisite check was run successfully.
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