I am having issues with Time Machine. Error message "The backup disk image could not be created.

Error message "The backup disk image could not be created." I have tried everything I have found online in the community from TM full reset  to changing my computers name. Anything else I can try? I am using a Seagate external HD with a connection through my router. I spent an hour on the phone with seagate and everything is ok on the HD end.
TM sees it and it is mounted but cannot go any further. HELP?!!!!
Thanks
-A

How should it be connected? It has a usb port and ethernet. The USB on the ExHD looks like the port on the back of my computer, so I would need one wth the same ends? Do they make those?
I can usually fix most my comp problems myself, but this new ExHD has stumped me.
Thanks for your help.
-A

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