Error : Unable to open pty: No such file or directory

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You may get an error while entering to a openvz vps. You cant also ssh to the vps from outside.
Error:
vzctl enter 1022
enter into VE 1022 failed
Unable to open pty: No such file or directory


1. If it is a redhat based system such as centos,
The solution is
vzctl exec VEID /sbin/MAKEDEV pty
vzctl exec VEID /sbin/MAKEDEV tty
vzctl enter VEID

To fix this issue permanently
Edit the file /etc/rc.sysinit of the VPS
Comment the line
/sbin/start_udev   to
#/sbin/start_udev 
Add the following lines after /sbin/start_udev:
/sbin/MAKEDEV tty
/sbin/MAKEDEV pty



2. If it is a debian system
vzctl exec veid update-rc.d -f udev remove
vzctl restart veid