Unity File Import stuck in "Cutting Over" state.

I'm trying to import CIFS VDM from VNX5300 to UnityVSA. 

The session is stuck in "cutting Over" state. I can't cancel it. I get this error:

Failed: Import source side command execution failed. (Error Code:0x9000147)

Rollback Result: Task was rolled back and marked as failed. This is because some tasks failed or SP rebooted during task execution. (Error Code:0x100a)

The connection cannot be deleted as there is a session active.

Failed: Failed to delete the import connection as there are some import sessions associated with this connection, that are neither cancelled nor completed. Import connection deletion will fail if there are sessions in Error state with a destination resource associated with them. For such sessions, try cancelling the sessions individually. After cancelling, the session may still stay in Error state, but Cancel operation will ensure that the destination resource has been deleted. (Error Code:0x6500195)

Can anyone help please.

Thanks