I get the following error and exeption when importing a fcpxml file (version = 1.10) in Vegas 19:

Format element doesn't have a "fieldOrder" attribute.
Exception Message: startIndex cannot be larger than length of string.
Parameter name: startIndex
Stack Trace:   at System.String.Substring(Int32 startIndex, Int32 length)
   at VegasScripts.VegasCommon.GetImportMediaPath(String pathInImportedFile, List`1 mediaLocations)
   at VegasScripts.FcpXImporter.ImportMedia(Vegas vegas, Project project, XmlDocument doc)
   at VegasScripts.FcpXImporter.Import(String fileName, Vegas vegas, Project project, LogCallback log, Action createUndoBlock, Action disposeUndoBlock)
   at VegasScripts.ProjectInterchangeImporter.HandleInvokedInternal(String openDialogName, String openDialogExt, String undoBlockName, IImporter importer)