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    The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!

    Java error when launching game with mods

    Scheduled Pinned Locked Moved I need help
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    • Z Offline
      Zhabok
      last edited by

      So as the title says i cannot force mods to work, but i do really wanna try them. The error occurs whenever i start a game with modes on. The error is:

      Client Version: 2025.9.1
      java.lang.IllegalStateException: Unable to write active mods to game.prefs file
      at com.faforever.client.mod.ModService.overrideActivatedMods(ModService.java:363)
      Suppressed: The stacktrace has been enhanced by Reactor, refer to additional information below:
      Assembly trace from producer [reactor.core.publisher.MonoPeekFuseable] :
      reactor.core.publisher.Mono.doOnNext
      com.faforever.client.mod.ModService.updateAndActivateModVersions(ModService.java:397)
      Error has been observed at the following site(s):
      *__Mono.doOnNext ⇢ at com.faforever.client.mod.ModService.updateAndActivateModVersions(ModService.java:397)
      Original Stack Trace:
      at com.faforever.client.mod.ModService.overrideActivatedMods(ModService.java:363)
      at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:196)
      at reactor.core.publisher.Operators$BaseFluxToMonoOperator.completePossiblyEmpty(Operators.java:2096)
      at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:118)
      at reactor.core.publisher.FluxConcatIterable$ConcatIterableSubscriber.onComplete(FluxConcatIterable.java:121)
      at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onComplete(FluxDefaultIfEmpty.java:139)
      at reactor.core.publisher.FluxOnErrorReturn$ReturnSubscriber.onComplete(FluxOnErrorReturn.java:169)
      at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:299)
      at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:246)
      at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)
      at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.complete(MonoIgnoreThen.java:294)
      at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onNext(MonoIgnoreThen.java:188)
      at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:237)
      at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
      at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)
      at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)
      at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onNext(FluxFilterFuseable.java:118)
      at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:299)
      at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82)
      at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:210)
      at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replayNormal(FluxReplay.java:618)
      at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replay(FluxReplay.java:709)
      at reactor.core.publisher.FluxReplay$ReplaySubscriber.onNext(FluxReplay.java:1345)
      at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:210)
      at reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99)
      at reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.onNext(FluxRetryWhen.java:178)
      at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onNext(MonoFlatMapMany.java:251)
      at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
      at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onNext(MonoFlatMapMany.java:251)
      at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:335)
      at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:294)
      at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onSubscribeInner(MonoFlatMapMany.java:150)
      at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onSubscribe(MonoFlatMapMany.java:246)
      at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:201)
      at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:83)
      at reactor.core.publisher.Flux.subscribe(Flux.java:8891)
      at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onNext(MonoFlatMapMany.java:196)
      at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:158)
      at reactor.core.publisher.MonoReduce$ReduceSubscriber.onComplete(MonoReduce.java:197)
      at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152)
      at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152)
      at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onComplete(FluxPeekFuseable.java:277)
      at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152)
      at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:413)
      at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:455)
      at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:509)
      at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:821)
      at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:115)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
      at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
      at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
      at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
      at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
      at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
      at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
      at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1519)
      at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1377)
      at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1428)
      at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:530)
      at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:469)
      at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
      at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
      at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
      at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
      at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868)
      at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
      at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:796)
      at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732)
      at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658)
      at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
      at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:998)
      at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
      at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
      at java.base/java.lang.Thread.run(Thread.java:1583)

      -Read only tag is off for game,prefs, yet in the appdata folder its called "Game.prefs", and not "game.prefs" as the error refers to

      1 Reply Last reply Reply Quote 0
      • Z Offline
        Zhabok
        last edited by

        -fixed by reinstalling completely faf

        1 Reply Last reply Reply Quote 1

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