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The following error may occur when starting ArcMap:
Error: ArcGISFMEDataSource: Error in FMEDataSourceUtils::Session
A customization installed by Safe Software's FME Suite 2003X2 cannot find a license. This can occur even if the FME Suite was removed, because the uninstall procedure sometimes fails to properly unregister the custom .dll file.
Either register or renew the licensing for the FME extension for ArcGIS or unregister the FME extension's dll.
Note: <path> is the path to this file. By default, the file is located in \application_extenders\arcgis\ArcGISFMEDataSource.dll.