cdj 3000 doesn't communicate with cdj1500x pro dj link

I have 2 cdj 3000 and 1 cdj 1500x connected to a HUB via pro dj link,,
the cdj 1500 does not recognize the USB drive that is plugged into the cdj 3000 or vice versa.
I get the following message : Some pro dj link features may not work properly due to an  old model player included in the pro dj link .
all 3 cdj are updated with the latest firmware .
what do I do for this works?