DHCP Failover

I am attempting to configure a DHCP failover using server 2012. I am receiving an error that reads

"The specified DHCP client is not a reserved client. Configure failover failed. Error 20018. The specified DHCP client is not a reserved client."

Any ideas why I am receiving this?
Mehdi MomeniAsked:
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MaheshConnect With a Mentor ArchitectCommented:
if you have any "Bad address" seen in scope as leased out, delete that once and then try to build cluster again
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DrDave242Commented:
What exactly are you attempting to do when you receive this error? From what I've found, the most common cause of this error is attempting to create a reservation for an address that's outside of the DHCP address range. For example, if your scope's address range is 192.168.1.51 - 192.168.1.100 and you try to create a reservation for 192.168.1.30, you'll receive that error.
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Mehdi MomeniAuthor Commented:
I had an error in the DHCP reservation that was resolved by fixing it. Thanks for your help.
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