OpenSUSE Network :: Opennebula - No TTY Present / Askpass Program Not Specified

I have a problem with Opennebula that I have been trying t o solve for weeks, I have tried many options and have got nowhere. I have two HP ML115 servers configured to act as opennebula cluster nodes named opennebula01 and opennebula02. I have also installed the Front-end opennebula management deamon on node opennebula01. To use opennebula I have created a paswordless oneadmin user which seems to be ok because I can ssh to localhost and both nodes without a password. Using the onehost command I have created two hosts both tehse hosts are running correctly.
See Example1.

Periodically the opennebula monitoring system will fail, the problem I am having is that the logs keep showing the message:
"sudo: no tty present and no askpass program specified"
See example2
I have used the visudo command to change the sudoers Defaults visiblepw option but I just get a "root's password:root's password:sudo: pam_authenticate: Conversation error" error.
See Example 3 and Example 4.

Example1
========
oneadmin@opennebula01:/srv/cloud/images/ttylinux> onehost list
ID NAME RVM TCPU FCPU ACPU TMEM FMEM STAT
0 opennebula01 0 0 0 100 0 0 on
1 opennebula02 0 0 0 100 0 0 on

Example 2
=========
Tue Mar 16 23:16:10 GMT 2010
linux@opennebula01:~/Desktop> su oneadmin
Password:
oneadmin@opennebula01:/home/linux/Desktop> tail -f $ONE_LOCATION/var/oned.log
tail: /srv/cloud/one/var/oned.log: file truncated
Tue Mar 16 23:29:44 2010 [VMM][I]: Loading Virtual Machine Manager drivers.....

Example 3
=========
sudoers
# Comment out the preceding line and uncomment the following one if you need to use special input methods. This may allow users to compromise the root account if they are allowed to run commands without authentication.
#Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL LANGUAGE LINGUAS XDG_SESSION_COOKIE XMODIFIERS GTK_IM_MODULE QT_IM_MODULE QT_IM_SWITCHER"
#Defaults visiblepw

# In the default (unconfigured) configuration, sudo asks for the root password.
# This allows use of an ordinary user account for administration of a freshly installed system. When configuring sudo, delete the two following lines:
Defaults targetpw # ask for the password of the target user i.e. root
ALL ALL=(ALL) ALL # WARNING! Only use this together with 'Defaults targetpw'!
# Runas alias specification
# User privilege specification
root ALL=(ALL) ALL
# Uncomment to allow people in group wheel to run all commands
# %wheel ALL=(ALL) ALL
# Same thing without a password
# %wheel ALL=(ALL) NOPASSWD: ALL
# Samples
# %users ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
# %users localhost=/sbin/shutdown -h now
# Added for opennebula to allow oneadmin to execute xen commands
%xen ALL=(ALL) NOPASSWD: /usr/sbin/xm *
%xen ALL=(ALL) NOPASSWD: /usr/sbin/xentop *

Example 4
=========
Tue Mar 16 23:49:20 2010 [InM][I]: Monitoring host opennebula01 (0)
Tue Mar 16 23:49:20 2010 [InM][I]: Monitoring host opennebula02 (1) .....
Conversation error
Tue Mar 16 23:50:22 2010 [InM][I]: /tmp/one-im//one_im-0ed949a4bd6f9d3a8e845559ac44e11f:70: undefined method `-' for nil:NilClass (NoMethodError)
Tue Mar 16 23:50:22 2010 [InM][I]: ExitCode: 1

Example 5
=========
oneadmin@opennebula01:/home/linux/Desktop> cd /tmp/one-im/
oneadmin@opennebula01:/tmp/one-im> ls -l
total 16
-rwxr-xr-x 1 oneadmin cloud 3121 2010-03-16 23:56 one_im-0ed949a4bd6f9d3a8e845559ac44e11f
-rwxr-xr-x 1 oneadmin cloud 170 2010-03-16 23:56 one_im-2b966ff3406441e176e9c1d82d536763
-rwxr-xr-x 1 oneadmin cloud 38 2010-03-16 23:56 one_im-34d4a5b5a67817fa9d403fa4be5a8493
-rwxr-xr-x 1 oneadmin cloud 32 2010-03-16 23:56 one_im-91090fd8b53b1cf7ce51f3e4215506e3

Example 6
=========
oneadmin@opennebula01:/tmp/one-im> cat one_im-0ed949a4bd6f9d3a8e845559ac44e11f
#!/usr/bin/env ruby .....