Cooper scene controller failed at setting special association

I’m having trouble with a Cooper 5 button scene switch. UI4
During the units “Configuring Zwave devices” I GET the message “node reports it is busy” and then “failed at: setting special association”
I can get one button to work, but not the others.
Any thoughts on where to start?

OK, found the issue. One zwave switch associated with scenes was acting up. Removed this switch from all scenes associated with device and it worked.
The switch must have been trying to poll the bad switch and always reported busy