Using mkgmap version 4808 - when compiling Europe. It went through fine on all geofabrik country extracts. I then upgraded to mkgmap 4819 and yesterday downloaded a new europe extract (4 days newer) from geofabrik to see if I can reproduce it again - and the error message is identical. I'm going to run with default style now again - to see if it makes a difference. C:\openmtbmap\mkgmap.jar --max-jobs=11 --order-by-decreasing-area "--generate-sea" --code-page=65001 "--precomp-sea=E:\OpenMTBMap\osmpbf_geofabrik\sea.zip" "--style-file=C:\openmtbmap\openmtbmap_style" --add-boundary-nodes-at-admin-boundaries --fix-roundabout-direction --improve-overview --drive-on=detect --allow-reverse-merge --lower-case --nsis --index --levels="0:24, 1:23, 2:22, 3:21, 4:20, 5:19, 6:18" --overview-levels="7:17, 8:16, 9:15, 10:14, 11:13, 12:12" --add-pois-to-areas --pois-to-areas-placement=entrance=main;entrance=yes;building=entrance;barrier=entrance --simplify-lines=23:2.6,22:4.2,21:5.4,20:6,19:7,18:7.5,17:4.5,16:5,15:5,14:6 --simplify-polygons=23:3.6,22:7,21:6,20:9,17:5.4 --add-boundary-nodes-at-admin-boundaries=2 --cycle-map --ignore-fixme-values --housenumbers --road-name-config=C:\openmtbmap\openmtbmap_svn\roadNameConfig.txt --split-name-index --link-pois-to-ways --ignore-turn-restrictions --polygon-size-limits="24:12, 23:14, 22:14, 21:20, 20:20, 19:20, 18:20, 17:20, 16:20, 15:20, 14:20, 13:25" --description=omtb_eu --show-profiles=1 --location-autofill=bounds,is_in,nearest --bounds=E:\OpenMTBMap\osmpbf_geofabrik\bounds.zip --route --country-abbr=eu --country-name=europe --mapname=65500000 --family-id=6550 --product-id=1 --series-name=omtb_europe_29.11.2021_UC_LOCAL --family-name=mtb_eu_29.11.2021_UC_LOCAL --tdbfile --x-gmapi-minimal --overview-mapname=mapsetc --keep-going --area-name="europe_29.11.2021_UC_LOCAL_omtb" -c D:\openmtbmap\maps\template.europe E:\OpenMTBMap\contourlines20\europe\7*.img typeu.TYP 1>NUL Number of MapFailedExceptions: 0 gmapi-minimal: Writing freshly compiled file C:\openmtbmap\maps\.\65500000.img gmapi-minimal: Writing freshly compiled file C:\openmtbmap\maps\.\65500001.img gmapi-minimal: Writing freshly compiled file C:\openmtbmap\maps\.\65500002.img gmapi-minimal: Writing freshly compiled file C:\openmtbmap\maps\.\65500003.img gmapi-minimal: Writing freshly compiled file C:\openmtbmap\maps\.\65500004.img ................ skipped ..................... long list of contourline files: ......... gmapi-minimal: Skipping file E:\OpenMTBMap\contourlines20\europe\75500447.img WARNING (global): Input file E:\OpenMTBMap\contourlines20\europe\75500448.img has different code page 1252 WARNING (global): Input file E:\OpenMTBMap\contourlines20\europe\75500448.img has different charset type 10 WARNING (global): Input files have different code pages gmapi-minimal: Skipping file E:\OpenMTBMap\contourlines20\europe\75500448.img .... 448 is the highest number contourlines file *............And here comes the error* it happens on writing the address index mdr file - mapset.img and mapset.tdb have already been created. Exception in thread "main" java.lang.IllegalArgumentException at java.base/sun.nio.ch.FileChannelImpl.position(FileChannelImpl.java:355) at uk.me.parabola.imgfmt.sys.ImgFS.sync(ImgFS.java:249) at uk.me.parabola.imgfmt.sys.ImgFS.close(ImgFS.java:325) at uk.me.parabola.mkgmap.combiners.MdrBuilder.onFinish(MdrBuilder.java:334) at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:690) at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:126) at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:147) at uk.me.parabola.mkgmap.main.Main.main(Main.java:118) -- Felix Hartman - Openmtbmap.org & VeloMap.org