running remote job and applying credentials

I have read the manual but am getting mixed results. When i start the agent as a user and apply different user credential the job fails.
see below
RROR com.softtreetech.jscheduler.business.runner.JobExecutorImpl - Job errors: Create process error. Extended error: ERROR4234 Can't set GID/EGID at ./runas.pl line 30.

When i start the agent as root and apply credentials for another user the job runs but when i check the system logs it runs as root.

Im confused, does the Agent actually uses the runas.pl files correct so that the one i need to start with root? If thats the case i am doing it correct and its still running as root.

This is exactly what the users guide says
Unix/Linux/Mac: 24x7 Scheduler must be run using root account in order to allow jobs using other user accounts

What about scheduler running on a WindowsXP OS pc using the Java multiplatform edition?

In order for the agent to be able to create processes on behave of other users it must be started under root account. The agent uses runas.pl to start a process. Runas.pl starts running as a root user because it is launched from the agent, it then changes the user context of its own process to the specified user and launches the job command line, this is similar to how one would use su command. If you use ps command to monitor started processes process, try scheduling something taking a while to run, the runas and the launched process should appear running with the specified user account

On Windows platforms it is similar but the implementation is different. The scheduler is using runas.exe utility to create processes on behave of other users. It doesn't need to be a root account, but it needs "act as part of operation system" privilege and also "create and modify security tokens" privileges.