Launching issues Need help

Dies anyone know how to cure it?

Client Version: 2023.1.2
java.lang.Error: java.nio.charset.UnmappableCharacterException: Input length = 2
at java.base/java.lang.String.decodeWithDecoder(String.java:1212)
at java.base/java.lang.String.newStringNoRepl1(String.java:786)
at java.base/java.lang.String.newStringNoRepl(String.java:738)
at java.base/java.lang.System$2.newStringNoRepl(System.java:2390)
at java.base/java.nio.file.Files.readString(Files.java:3369)
at com.faforever.client.mod.ModService.readPreferencesFile(ModService.java:313)
at com.faforever.client.mod.ModService.readActiveMods(ModService.java:329)
at com.faforever.client.mod.ModService.enableSimMods(ModService.java:231)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:699)
at com.faforever.client.mod.ModService$$SpringCGLIB$$0.enableSimMods(<generated>)
at com.faforever.client.game.GameService.lambda$joinGame$10(GameService.java:332)
at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147)
at com.faforever.client.task.CompletableTask.lambda$new$2(CompletableTask.java:19)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.concurrent.EventHelper.fireEvent(EventHelper.java:219)
at javafx.concurrent.Task.fireEvent(Task.java:1359)
at javafx.concurrent.Task.setState(Task.java:725)
at javafx.concurrent.Task$TaskCallable.lambda$call$1(Task.java:1437)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.nio.charset.UnmappableCharacterException: Input length = 2
at java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:275)
at java.base/java.lang.String.decodeWithDecoder(String.java:1205)
... 38 more

try to remove game.prefs file, it helper for me

Now it's another issue appeared:

Client Version: 2023.1.2
java.io.FileNotFoundException: C:\ProgramData\FAForever\bin\ForgedAlliance.exe (The process cannot access the file because the file is in use by another process.)
at java.base/java.io.RandomAccessFile.open0(Native Method)
at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:344)
at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:259)
at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:213)
at com.faforever.commons.fa.ForgedAllianceExePatcher.patchVersion(ForgedAllianceExePatcher.java:22)

This is not related to your first issue - simply restart your PC and the blocking file should be resolved.

@magge I'm doing this and it helps but appears next time very quick. Like next game for sure. Is there any solution or at least understanding why this is happening? Thank you very much

Which issue appears next time very quick?