Unable to add PDFG user accounts

Problem: 
When attempting to add a new user in :  adminui -> services -> LiveCycle PDF Generator ES2 -> User Accounts, it results in the following error:

ALC-PDG-030-003-User account information for user pdfg1 is not valid for the machine......

 The system.log shows this:

ERROR [STDERROR] sudo

ERROR [STDERROR] : sorry, you must have a TTY to run sudo

Reason:
The reason for this is an update along the way with sudo locked it down further by adding the below line to /etc/sudoers configuration file:

1 Defaults requiretty

Solution:
To allow a remote script to login and run a command via sudo simply comment out that line as shown below:

1 # Commented out so remote script can login and run a command without a tty
2 # Defaults requiretty