Time Machine error code 92
I get the error code 92 "Backup failed - time machine could not back up to Elements SE"
This initially happened after updating to Catalina on my iMac. I was using a Lacie drive and thought I would need to update my back up disk. So bought an Elements drive to replace it. This however made no difference and the back up continues to fail.
What could be the solution to this problem, to get the Time Machine to work properly?
Thanks
iMac 27", macOS 10.15