josm conflict not showing the error

[baditaflorin]

i get the dialog that i have a conflict, but the conflict is not displayed

INFO: GET https://api.openstreetmap.org/api/0.6/user/details (get number of unread messages)
INFO: PUT https://api.openstreetmap.org/api/0.6/changeset/34737073...
INFO: OK
INFO: POST https://api.openstreetmap.org/api/0.6/changeset/34737073/upload...
INFO: Precondition Failed
WARNING: java.io.IOException: Server returned HTTP response code: 412 for URL: https://api.openstreetmap.org/api/0.6/changeset/34737073/upload. Cause: java.io.
erver returned HTTP response code: 412 for URL: https://api.openstreetmap.org/api/0.6/changeset/34737073/upload
java.io.IOException: Server returned HTTP response code: 412 for URL: https://api.openstreetmap.org/api/0.6/changeset/34737073/upload
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
        at org.openstreetmap.josm.io.OsmApi.getConnectionStream(OsmApi.java:733)
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:673)
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:595)
        at org.openstreetmap.josm.io.OsmApi.uploadDiff(OsmApi.java:538)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadChangesInChunks(OsmServerWriter.java:175)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadOsm(OsmServerWriter.java:218)
        at org.openstreetmap.josm.gui.io.UploadPrimitivesTask.realRun(UploadPrimitivesTask.java:250)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:93)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:161)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 412 for URL: https://api.openstreetmap.org/api/0.6/changeset/34737073/upload
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at java.net.HttpURLConnection.getResponseCode(Unknown Source)
        at java.net.HttpURLConnection.getResponseMessage(Unknown Source)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseMessage(Unknown Source)
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:658)
        ... 10 more
ERROR: Error header: Precondition failed: The relation 3533355 is used in relation 5209307.
ERROR: org.openstreetmap.josm.io.OsmApiException: ResponseCode=412, Error Header=<Precondition failed: The relation 3533355 is used in relation 5209307.>
org.openstreetmap.josm.io.OsmApiException: ResponseCode=412, Error Header=<Precondition failed: The relation 3533355 is used in relation 5209307.>
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:716)
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:595)
        at org.openstreetmap.josm.io.OsmApi.uploadDiff(OsmApi.java:538)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadChangesInChunks(OsmServerWriter.java:175)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadOsm(OsmServerWriter.java:218)
        at org.openstreetmap.josm.gui.io.UploadPrimitivesTask.realRun(UploadPrimitivesTask.java:250)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:93)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:161)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
INFO: GET https://api.openstreetmap.org/api/0.6/relation/3533355/relations