The settings files that are stored inside the subbfolder Docuflow (of where your REvit file is located) have now changed. The intention was to simplify it, and prevent errors. Now the filename matches the Revit filaneme therefore will not throw errors.

If you are upgrading to Docuflow 3.6 or later, you need to rename the settings saved by the previous versions of Docuflow. Just remove the text after the filename of your Revit file.

Example:

Revit file: A.rvt

Settings file shall be: A.xml