Upgrade 2016-2017 - Workflow issue

Hi everyone,

I am upgrading from NAV 2016 to 2017.
For the data upgrade, I used the following command:
Start-NavDataUpgrade -ServerInstance XXX -Force
It stops in the very beginning, and when investigating the error, I get the following:
There is one or more workflow instances.You must complere all running workflows before proceeding with the upgrade.
Did anyone face this before?
How shall I proceed about that?

Thanks in advance