can not save the root element in the map

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Symptom
The import server fails and the following error, or similar, is written in the log file under the distribution folder:
Error: The import map is not complete:1. Missing the XML Root Element.2. There are multiple root elements defined in the xml schema.Solution: Please select the proper root element via the IM GUI then save the map.
Other terms
mdis import server automatic
Solution
Connect to the source as you did previously and open the map. Once the
map has been opened save the map again and then rerun the import server.