You have a group consisting of several workstations and trying to schedule a job to all members of the group
After attempting to schedule the job, the GSS Console shows the error message below:
GSS 3.x
This happens when security has been configured to set the maximum number of computers that can be selected for a single schedule of a job.
From the console, go to Tools -> Security
Click on the User, select Rights
Navigate to Restrictions tab as seen below, and make sure Maximum Number of computers is set to 0