Can't seem to open G drive 3tb

Hello,

I haven’t used my G drive 3tb for a week and nw when I link it to my macbook it says: “G-DRIVE USB” can’t be opened because the original item can’t be found."

Anyone have an idea? Would be great. I’m not that computer minded. I can not eject it either. I just have to unplug it or turn it off.

Thanks