USB redirection error using virt-manager QEMU/KVM

Trying to passtrough USB device to VM I get this error

virtualisation.spiceUSBRedirection.enable

is set to true in configuration. What else could I try?

so first of all did you make sure that no other application is using it?
If you still get the error maybe you can find the solution here:

You are right, gnome automount was using the descriptor, pinpointed with fuser. I’ve completely forgotten this great program. Thanks!

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