Clearing code 1121

Hello, purchased an ext drive (WD also) plugged in the USB in back and this error showed up. Red light indicator in front. I just want the new drive for extra capacity, how do I get rid of the error and red light?

Unsupported File System
An unsupported file system has been detected on a USB device (vendor Western_Digital, model: My_Book_25EE, serial number: WX11D3744EYN, file system: N/A, label: N/A). Please remove the USB device.
Monday, 2018 March 19, 3:55:45 PM
Code:1121

tanx much

André

What file system is the USB drive formatted in?

Here are the supported file systems for external drives on the my cloud home

https://support.wdc.com/knowledgebase/answer.aspx?ID=18943

Mean’s it’s NOT a My Cloud Home, but indeed a My Cloud.
The SN provided in WDBBGB0060HBK My Book 6 TB which means the My Cloud KBA is the right one