Linux - problem loading RouteConverter

[routeconverter]

Any suggestions as to a soloution?

Something is going wrong  during the initialization of RouteConverter. Maybe there is no internet?

Code:

Jul 06, 2019 3:02:09 PM slash.navigation.converter.gui.RouteConverter lambda$initializeDatasources$14
WARNING: Could not update datasource manager: java.lang.IllegalArgumentException: Download slash.navigation.download.Download@94a96f5c[action=Copy, url=https://api.routeconverter.com/v1/editions/offline/?format=xml] not found in [slash.navigation.download.Download@3d4cf0c7[action=Copy, url=https://api.routeconverter.com/v1/mapservers/?format=xml]], java.lang.IllegalArgumentException: Download slash.navigation.download.Download@94a96f5c[action=Copy, url=https://api.routeconverter.com/v1/editions/offline/?format=xml] not found in [slash.navigation.download.Download@3d4cf0c7[action=Copy, url=https://api.routeconverter.com/v1/mapservers/?format=xml]]
at slash.navigation.download.DownloadTableModel.addDownload(DownloadTableModel.java:83)
at slash.navigation.download.DownloadTableModel.addOrUpdateDownload(DownloadTableModel.java:107)
at slash.navigation.download.DownloadManager.startExecutor(DownloadManager.java:211)
at slash.navigation.download.DownloadManager.queue(DownloadManager.java:260)
at slash.navigation.download.DownloadManager.queueForDownload(DownloadManager.java:270)
at slash.navigation.datasources.DataSourceManager.downloadEdition(DataSourceManager.java:140)
at slash.navigation.datasources.DataSourceManager.update(DataSourceManager.java:119)
at slash.navigation.converter.gui.RouteConverter.lambda$initializeDatasources$14(RouteConverter.java:1266)
at java.base/java.lang.Thread.run(Thread.java:834)

I did change the properties of RouteConverter to allow it to be run as a programme before attempting this.

What does that mean?