Ldap User creations error in zentyal 3.5

[yasarssp]

i have getting this error while creating users in zentyal

error

root command set -e mkdir -p `dirname /home/arjun_b` cp -dR --preserve=mode /etc/skel /home/arjun_b chown -R arjun_b /home/arjun_b chgrp -R '+2513' /home/arjun_b chmod 0700 /home/arjun_b failed. Error output: chown: invalid user: ‘arjun_b’ Command output: . Exit value: 1 at /usr/share/perl5/EBox/Sudo.pm line 240