[Centos] ERROR: Could not find useradd in chroot, maybe the install failed?

[mockbuild at localhost ~]$ mock -r centos-5-x86_64-testdev.cfg init

init

clean

prep

This may take a while

ending

done

Finished initializing root

[mockbuild at localhost ~]$ mock -r centos-5-x86_64-testdev.cfg

backuppc-3.1.0-1.el5.centos.src.rpm

init

clean

prep

This may take a while

setup

build

ending

done

Results and/or logs in: /var/lib/mock/centos-5-x86_64/result