BuildrootError in Koji

[Debarshi 'Rishi' Ray]

"BuildrootError: could not init mock buildroot, mock exited with status 100"

I get the above error message while trying to scratch build two of my packages.
http://koji.fedoraproject.org/koji/taskinfo?taskID=127663
http://koji.fedoraproject.org/koji/taskinfo?taskID=127674

I am using the standard value of BuildRoot mentioned in the packaging
guidelines.

What is going wrong?

Thanks,
Debarshi
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