open ttydev: Permission denied

UNIX HP-UX
1

Whenever I try to open xterm, below error loops in itself

adroit:/home/seo/hitendra/.dt 32> xterm &
open ttydev: Permission denied
open ttydev: Permission denied
open ttydev: Permission denied
open ttydev: Permission denied
....
....
....

This error sometime comes ,sometime not.
What is the root cause ? Please look in to this issue

2

Just taking a shot in the dark, check the permissions on /dev/tty.