Before I got this error I hade several conflicts on bus routes which fixed (I thought).
The JOSM validator shows no errors.
The error node is marked as “add” in the upload pane.
I have saved the upload file as an local file.
In that file I find the error node:
Is it about the node 588599424, related with this changeset, which has been deleted 11 hours ago? If so, maybe you tried to edit that node after it was deleted (for example JOSM not having the latest latest data for some reason, thus editing a node which doesn’t exist).
How do you upload data to OSM? As single object, one at a time, or everthing at once?
This seems like a bug in JOSM. The API complains about missing information in the upload itself. Best is to create a JOSM ticket, and attach your sample file.
I have done all edit with the JOSM on a local file.
I could find the problem node in my local osm-file (see my first posting), and after deleting the node line in the osm-file, the I could do the upload without errors.
The error node was an stop position on a bus route, so I suspect the route now has error. I have to check that.