plugable Imac 20" 7.1 not working with Plugable USB3-SATA-UASP1

USB Drive Docks and Card Readers USB3-SATA-UASP1
1

when i power up the dock all i get is a message saying “not readable”

2

Hi Javier,

Thanks for contacting Plugable! We emailed you a response directly, but have not heard back. I’m pasting the contents of the email here in case it didn’t make it through, or accidentally ended up in your spam folder:

A couple of quick questions that will help me to better understand what might be happening with the system:
-Does the disk contain existing data, or is it new/empty?
-If it contains existing data, what type of system or drive dock was the disk used with previously?

Thanks!
Gary