When the VertiGIS DXF Export for ArcMap tool is installed independently of GEONIS, the error logging does not work
(Only valid for version 220.127.116.11 and earlier)
The logging configuration file does not have the proper name.
Rename the file
C:\Program Files (x86)\VertiGIS\Dxf export for ArcMap\GEOCOM.GNSDatashop.Export.DXF.ArcMap.Command.dll.config