The same error happens with server 1.15.2-31.2.0, 1.15.2-31.2.36 and 1.16.2-33.0.22. I'm running a FreeBSD 12.1-STABLE server.

 

Run forge-<version>-installer.jar after a clean minecraft server install. The forge install runs uneventfully.  

 

When I try to run it, the following error message is displayed

Quote

[15:43:15] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmlserver, --fml.forgeVersion, 33.0.22, --fml.mcpVersion, 20200812.004259, --fml.mcVersion, 1.16.2, --f>

[15:43:15] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 6.1.1+74+master.966c698 starting: java version 1.8.0_241 by Oracle Corporation

[15:43:16] [main/INFO] [ne.mi.fm.lo.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust

[15:43:16] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8 Source=file:/Media/Minecraft/forge/libraries/org/spongepowered/mixin/0.8/mixin-0.8.jar Service=ModLauncher Env=SERVER

Exception in thread "main" [15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.RuntimeException: java.io.IOException: Function not implemented

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.FileWatcher$WatchedDir.<init>(FileWatcher.java:220)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.FileWatcher$WatchedDir.<init>(FileWatcher.java:210)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.FileWatcher.lambda$addWatch$0(FileWatcher.java:81)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.FileWatcher.addWatch(FileWatcher.java:81)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.FileWatcher.addWatch(FileWatcher.java:69)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.AutoreloadFileConfig.<init>(AutoreloadFileConfig.java:18)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at com.electronwill.nightconfig.core.file.GenericBuilder.build(GenericBuilder.java:242)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.FMLConfig.loadFrom(FMLConfig.java:57)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.FMLConfig.load(FMLConfig.java:77)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.fml.loading.FMLServiceProvider.initialize(FMLServiceProvider.java:81)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServiceDecorator.onInitialize(TransformationServiceDecorator.java:68)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.lambda$initialiseTransformationServices$7(TransformationServicesHandler.ja>

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at java.util.HashMap$Values.forEach(HashMap.java:981)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.initialiseTransformationServices(TransformationServicesHandler.java:107)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:59)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.Launcher.run(Launcher.java:75)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain$Runner.runLauncher(ServerMain.java:63)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain$Runner.access$100(ServerMain.java:60)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]:       at net.minecraftforge.server.ServerMain.main(ServerMain.java:57)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.io.IOException: Function not implemented

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]:       at sun.nio.fs.LinuxWatchService.<init>(LinuxWatchService.java:64)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]:       at sun.nio.fs.LinuxFileSystem.newWatchService(LinuxFileSystem.java:47)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]:       at com.electronwill.nightconfig.core.file.FileWatcher$WatchedDir.<init>(FileWatcher.java:218)

[15:43:16] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]:       ... 20 more

 The server installer log for 1.16.2-33.0.22: Installer log(removed, see my reply)

 The server installer log for 1.16.2-33.0.22: Installer log(removed, see my reply)

Edited August 30, 20205 yr by Capiguava
complement

Nevermind! I figured it out: a problem in my java environment.

For the sake of information, I used the linux-oracle-jre18-8.241 package. After its removal and posterior installation of openjdk8 everything is OK (all versions mentioned).

Edited August 30, 20205 yr by Capiguava
text correction