Loading open data causes an error message

[deuzeffe]

What steps will reproduce the problem?

1. Loading a .json such as ​https://raw.githubusercontent.com/nlehuby/jubilant-octo-broccoli/master/HauteVienne/HVIuuVehicleJourneyuuLR2417Ru20190901u1.json
2. Accept Loading Geojson and opendata

What is the expected result?

Loading without error message.

What happens instead?

Loading with error message. To note that JSOM runs fine. Also to note that without loading opendata, no error message appears. And plugin opendata seems update.

Maybe my local installation is not ok? So, how can correct?

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-24 22:06:28 +0100 (Mon, 24 Feb 2020)
Build-Date:2020-02-24 21:08:22
Revision:15927
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15927 fr) Linux Debian GNU/Linux 9.12 (stretch)
Memory Usage: 658 MB / 1820 MB (93 MB allocated, but free)
Java version: 1.8.0_242-8u242-b08-1~deb9u1-b08, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1440x900
Maximum Screen Size: 1440x900
Java package: openjdk-8-jre:amd64-8u242-b08-1~deb9u1
WebStart package: icedtea-netx:amd64-1.6.2-3.1+deb9u1
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-13+deb9u1
libcommons-logging-java: libcommons-logging-java:all-1.2-1
fonts-noto: fonts-noto:all-20161116-1
VM arguments: [-Dicedtea-web.bin.name=javaws, -Dicedtea-web.bin.location=/usr/bin/javaws, -Djava.security.manager, -Djava.security.policy=/etc/icedtea-web/javaws.policy]
Dataset consistency test: No problems found

Plugins:
+ FixAddresses (35248)
+ apache-commons (35092)
+ cadastre-fr (35332)
+ conflation (0.6.4)
+ ejml (35122)
+ epci-fr (35092)
+ geotools (35169)
+ gson (35158)
+ jaxb (35092)
+ jts (35122)
+ opendata (35330)
+ osm-obj-info (56)
+ pt_assistant (2.1.10-79-gb14a159)
+ reverter (35313)
+ scripting (30796)
+ todo (30306)
+ undelete (35313)
+ utilsplugin2 (35334)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Community_Centre&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Historical_Objects&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/PublicTransportOneClick&zip=1
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_preset_JOSM/master/FR.zip
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/PoliceFR&zip=1

Map paint styles:
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/FrenchEPCI&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransportV2&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1

Validator rules:
+ https://github.com/Jungle-Bus/transport_mapcss/raw/gh-pages/transport.validator.zip

Last errors/warnings:
- E: <josm.userdata>/plugins/opendata/resources/org/openstreetmap/josm/plugins/opendata/modules/fr/datagouvfr/datasets/agriculture/RegistreParcellaire.mapcss (Aucun fichier ou dossier de ce type)
- E: Handled by bug report queue: org.openstreetmap.josm.gui.progress.ProgressException: Expected states are [INIT] but current state is IN_SUBTASK
- E: Handled by bug report queue: org.openstreetmap.josm.gui.progress.ProgressException: Expected states are [INIT] but current state is IN_SUBTASK


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-1 (35) of JOSM
org.openstreetmap.josm.gui.progress.ProgressException: Expected states are [INIT] but current state is IN_SUBTASK
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.checkState(AbstractProgressMonitor.java:84)
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.beginTask(AbstractProgressMonitor.java:99)
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.beginTask(AbstractProgressMonitor.java:93)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:90)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:142)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

[Don-vip]

In 16124/josm:

fix #18770 - fix ProgressException with concurrent download tasks