Hi Carlos, no idea why this didn't pop up before.. The program tries to write an index section (MDR12) which cannot work with unicode characters. In fact I doubt that this section is of any use but mkgmap still writes it because it requires almost no space and maybe some old devices need it. With r4584 this should be fixed. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <carlos@alternativaslibres.org> Gesendet: Dienstag, 22. September 2020 10:45 An: Development list for mkgmap Betreff: [mkgmap-dev] Unable to build unicode map with index Hello all I am trying to build an unicode map of Israel or Greece but they always fail with java.lang.AssertionError as soon as I add --index to command line. I have tried both my own style and default one. Only if I use an small osm file as input it succeeds. The simplest command line that throws the error is: java -Xmx3G -ea -jar mkgmap_trunk.jar --bounds=bounds.zip --route --unicode --family-name="Test" --family-id=190 --product-id=1 --description="Test" --series-name="Test" --overview-mapname=55190000 --mapname=55190000 --index --style=default --remove-ovm-work-files=true 51178007.o5m Time started: Tue Sep 22 10:37:47 CEST 2020 Number of MapFailedExceptions: 0 Exception in thread "main" java.lang.AssertionError: 914 at uk.me.parabola.imgfmt.app.FileBackedImgFileWriter.put1u(FileBackedImgFileWriter.java:166) at uk.me.parabola.imgfmt.app.mdr.Mdr8.writeSectData(Mdr8.java:45) at uk.me.parabola.imgfmt.app.mdr.MDRFile.writeSection(MDRFile.java:421) at uk.me.parabola.imgfmt.app.mdr.MDRFile.writeSections(MDRFile.java:373) at uk.me.parabola.imgfmt.app.mdr.MDRFile.write(MDRFile.java:269) at uk.me.parabola.mkgmap.combiners.MdrBuilder.onFinish(MdrBuilder.java:334) at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:675) at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:125) at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:144) at uk.me.parabola.mkgmap.main.Main.main(Main.java:115) Test files can be found are 51178007.o5m <https://alternativaslibres.org/tmp/51178007.o5m> and jerusalem.o5m <https://alternativaslibres.org/tmp/jerusalem.o5m> _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev