The disks for this GEM need to have their labels set. 
You can do this when you format the disks. Here's what to label them.

disk1  "GEM  SYSTEM"  (2 spaces between GEM and SYSTEM)
disk2  "GEM SCREEN1"  (1 space)
disk3  "GEM SCREEN2"  (1 space)
disk4  "GEM PRINTR1"  (1 space)
disk5  "GEM PRINTR2"  (1 space)
disk6  "GEM PRINTR3"  (1 space)

The 1st Word and Gem Paint disks have no volume labels.