Hi, Since a couple of days the compilation for my France map fails. Perhaps the output log could help you to indicate me the direction I should investigate… - mkgmap-r4486 - java -version: openjdk version "13.0.2" 2020-01-14 OpenJDK Runtime Environment (build 13.0.2+8) OpenJDK 64-Bit Server VM (build 13.0.2+8, mixed mode) - France.log: Time started: Sat May 23 10:15:31 EAT 2020 The following styles are available: default 1.27: "Default style" modifié. Style détaillé pour un usage pédestre mais fonctionnel aussi en usage cycliste ou motorisé. Found one style in /home/steph/osm/styles/default/ finished check-styles Number of MapFailedExceptions: 0 Exception in thread "main" java.lang.AssertionError: 164041 at uk.me.parabola.imgfmt.app.BufferedImgFileWriter.put2u(BufferedImgFileWriter.java:164) at uk.me.parabola.imgfmt.app.trergn.Zoom.write(Zoom.java:81) at uk.me.parabola.imgfmt.app.trergn.TREFile.writeMapLevels(TREFile.java:215) at uk.me.parabola.imgfmt.app.trergn.TREFile.writeBody(TREFile.java:123) at uk.me.parabola.imgfmt.app.trergn.TREFile.write(TREFile.java:342) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:305) at uk.me.parabola.mkgmap.combiners.OverviewBuilder.writeOverviewMap(OverviewBuilder.java:191) at uk.me.parabola.mkgmap.combiners.OverviewBuilder.onFinish(OverviewBuilder.java:104) at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:674) at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:125) at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:143) at uk.me.parabola.mkgmap.main.Main.main(Main.java:114) Two little overlays (for ski resorts and particular osm tags I want to verify) are correctly produce. The main map compilation fails! Regards. Steph