Cannot run app with BepInEx and ValheimPlus

[overclockmp]

Hi there, similar to this previous question, I am also facing an app crash when enabling mods and using Valheim Plus.

You can find the logs below:

...
Feb 05 22:41:42 => Backups: 4
Feb 05 22:41:42 => BackupShort: 7200
Feb 05 22:41:42 => BackupLong: 43200
Feb 05 22:41:42 => Crossplay: 0
Feb 05 22:41:42 => ModSupport: 1
Feb 05 22:41:42 => EXTRAPARAM:
Feb 05 22:41:42 => Starting Valheim Server with steam support - Have fun playing!
Feb 05 22:41:42 Found UnityPlayer, hooking into it instead
Feb 05 22:41:42 [UnityMemory] Configuration Parameters - Can be set up in boot.config
Feb 05 22:41:42 "memorysetup-bucket-allocator-granularity=16"
Feb 05 22:41:42 "memorysetup-bucket-allocator-bucket-count=8"
Feb 05 22:41:42 "memorysetup-bucket-allocator-block-size=4194304"
Feb 05 22:41:42 "memorysetup-bucket-allocator-block-count=1"
Feb 05 22:41:42 "memorysetup-main-allocator-block-size=16777216"
Feb 05 22:41:42 "memorysetup-thread-allocator-block-size=16777216"
Feb 05 22:41:42 "memorysetup-gfx-main-allocator-block-size=16777216"
Feb 05 22:41:42 "memorysetup-gfx-thread-allocator-block-size=16777216"
Feb 05 22:41:42 "memorysetup-cache-allocator-block-size=4194304"
Feb 05 22:41:42 "memorysetup-typetree-allocator-block-size=2097152"
Feb 05 22:41:42 "memorysetup-profiler-bucket-allocator-granularity=16"
Feb 05 22:41:42 "memorysetup-profiler-bucket-allocator-bucket-count=8"
Feb 05 22:41:42 "memorysetup-profiler-bucket-allocator-block-size=4194304"
Feb 05 22:41:42 "memorysetup-profiler-bucket-allocator-block-count=1"
Feb 05 22:41:42 "memorysetup-profiler-allocator-block-size=16777216"
Feb 05 22:41:42 "memorysetup-profiler-editor-allocator-block-size=1048576"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-main=4194304"
Feb 05 22:41:42 "memorysetup-job-temp-allocator-block-size=2097152"
Feb 05 22:41:42 "memorysetup-job-temp-allocator-block-size-background=1048576"
Feb 05 22:41:42 "memorysetup-job-temp-allocator-reduction-small-platforms=262144"
Feb 05 22:41:42 "memorysetup-allocator-temp-initial-block-size-main=262144"
Feb 05 22:41:42 "memorysetup-allocator-temp-initial-block-size-worker=262144"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-background-worker=32768"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-job-worker=262144"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-preload-manager=262144"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-nav-mesh-worker=65536"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-audio-worker=65536"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-cloud-worker=32768"
Feb 05 22:41:42 "memorysetup-temp-allocator-size-gfx=262144"
Feb 05 22:41:42 Mono path[0] = '/run/vhserver-steam/valheim_server_Data/Managed'
Feb 05 22:41:42 Mono config path = '/run/vhserver-steam/valheim_server_Data/MonoBleedingEdge/etc'
Feb 05 22:41:42 Got override: ./unstripped_corlib
Feb 05 22:41:42 Current root dir: /run/vhserver-steam/valheim_server_Data/Managed
Feb 05 22:41:42 New root path: /run/vhserver-steam/unstripped_corlib
Feb 05 22:41:42 Search path: /run/vhserver-steam/unstripped_corlib:/run/vhserver-steam/valheim_server_Data/Managed
Feb 05 22:41:42 Setting config paths; basedir: /run/vhserver-steam; config: /run/vhserver-steam/valheim_server.x86_64.config
Feb 05 22:41:42 Managed dir: /run/vhserver-steam/valheim_server_Data/Managed
Feb 05 22:41:42 Fallback handler could not load library /run/vhserver-steam/valheim_server_Data/MonoBleedingEdge/x86_64/P���wU/mono/aot-cache/amd64/BepInEx.Preloader.dll.so
Feb 05 22:41:42 Got image: 0x55779cc09ab0
Feb 05 22:41:42 cant resolve internal call to "System.Threading.Interlocked::CompareExchange(T&,T,T)" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "System.Threading.Thread::GetCurrentThread()" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "System.Threading.Interlocked::CompareExchange(T&,T,T)" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "Mono.SafeStringMarshal::StringToUtf8(string)" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "Mono.SafeStringMarshal::StringToUtf8(string)" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "System.MissingMemberException::FormatSignature" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 cant resolve internal call to "System.Reflection.MemberInfo::get_MetadataToken" (tested without signature also)
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 Your mono runtime and class libraries are out of sync.
Feb 05 22:41:42 The out of sync library is: /run/vhserver-steam/unstripped_corlib/mscorlib.dll
Feb 05 22:41:42 2025-02-06T03:41:42Z
Feb 05 22:41:42 When you update one from git you need to update, compile and install
Feb 05 22:41:42 the other too.
Feb 05 22:41:42 Do not report this as a bug unless you're sure you have updated correctly:
Feb 05 22:41:42 you probably have a broken mono install.
Feb 05 22:41:42 If you see other errors or faults after this message they are probably related
Feb 05 22:41:42 and you need to fix your mono install first.
Feb 05 22:41:42 Caught fatal signal - signo:11 code:1 errno:0 addr:0x20
Feb 05 22:41:42 Obtained 46 stack frames.
Feb 05 22:41:42 #0 0x007f36f30aa520 in __sigaction
Feb 05 22:41:42 #1 0x007f36f10c045d in mono_install_ftnptr_eh_callback
Feb 05 22:41:42 #2 0x007f36f10c1644 in mono_install_ftnptr_eh_callback
Feb 05 22:41:42 #3 0x000000408bc516 in (Unknown)
Feb 05 22:41:42 #4 0x0000004099b887 in System.Diagnostics.StackTrace:GetFullNameForStackTrace (System.Text.StringBuilder,System.Reflection.MethodBase)
Feb 05 22:41:42 #5 0x00000040999ec7 in System.Diagnostics.StackTrace:AddFrames (System.Text.StringBuilder)
Feb 05 22:41:42 #6 0x00000040999c3b in System.Diagnostics.StackTrace:ToString ()
Feb 05 22:41:42 #7 0x00000040999b40 in System.Diagnostics.StackTrace:ToString (System.Diagnostics.StackTrace/TraceFormat)
Feb 05 22:41:42 #8 0x000000409998b3 in System.Environment:GetStackTrace (System.Exception,bool)
Feb 05 22:41:42 #9 0x000000409997eb in System.Exception:GetStackTrace (bool)
Feb 05 22:41:42 #10 0x0000004099915f in System.Exception:ToString (bool,bool)
Feb 05 22:41:42 #11 0x00000040998e97 in System.Exception:ToString ()
Feb 05 22:41:42 #12 0x00000040998f25 in (wrapper runtime-invoke) <Module>:runtime_invoke_object__this__ (object,intptr,intptr,intptr)
Feb 05 22:41:42 #13 0x00000040998bdb in (wrapper managed-to-native) Mono.SafeStringMarshal:StringToUtf8 (string)
Feb 05 22:41:42 #14 0x00000040998af3 in Mono.SafeStringMarshal:get_Value ()
Feb 05 22:41:42 #15 0x00000040998a33 in System.Environment:internalGetEnvironmentVariable (string)
Feb 05 22:41:42 #16 0x000000409989af in System.Environment:GetEnvironmentVariable (string)
Feb 05 22:41:42 #17 0x0000004098f2a3 in System.TimeZoneInfo:CreateLocal ()
Feb 05 22:41:42 #18 0x0000004098efe7 in System.TimeZoneInfo:get_Local ()
Feb 05 22:41:42 #19 0x0000004098ef77 in System.TimeZoneInfo:GetDateTimeNowUtcOffsetFromUtc (System.DateTime,bool&)
Feb 05 22:41:42 #20 0x0000004098e69b in System.DateTime:get_Now ()
Feb 05 22:41:42 #21 0x0000004098e203 in BepInEx.Preloader.Entrypoint:Main ()
Feb 05 22:41:42 #22 0x0000004098e610 in (wrapper runtime-invoke) object:runtime_invoke_void (object,intptr,intptr,intptr)
Feb 05 22:41:42 #23 0x007f36f10464a8 in mono_get_runtime_build_info
Feb 05 22:41:42 #24 0x007f36f11e5913 in mono_runtime_invoke
Feb 05 22:41:42 #25 0x007f36f11e80a5 in mono_unhandled_exception
Feb 05 22:41:42 #26 0x007f36f11e7f18 in mono_runtime_unhandled_exception_policy_set
Feb 05 22:41:42 #27 0x007f36f11e7d08 in mono_runtime_unhandled_exception_policy_set
Feb 05 22:41:42 #28 0x007f36f10bd695 in mono_debugger_run_finally
Feb 05 22:41:42 #29 0x007f36f10bbf1f in mono_debugger_run_finally
Feb 05 22:41:42 #30 0x007f36f1110471 in mono_breakpoint_clean_code
Feb 05 22:41:42 #31 0x000000408bc830 in (Unknown)
Feb 05 22:41:42 #32 0x007f36f10464a8 in mono_get_runtime_build_info
Feb 05 22:41:42 #33 0x007f36f11e5913 in mono_runtime_invoke
Feb 05 22:41:42 #34 0x007f36f11e5888 in mono_runtime_invoke
Feb 05 22:41:42 #35 0x007f36f521600c in jit_init_hook
Feb 05 22:41:42 #36 0x007f36f40c2840 in (Unknown)
Feb 05 22:41:42 #37 0x007f36f40db87d in (Unknown)
Feb 05 22:41:42 #38 0x007f36f414a045 in (Unknown)
Feb 05 22:41:42 #39 0x007f36f414a8f3 in PlayerMain(int, char**)
Feb 05 22:41:42 #40 0x007f36f3091d90 in __libc_init_first
Feb 05 22:41:42 #41 0x007f36f3091e40 in __libc_start_main
Feb 05 22:41:42 #42 0x00557760977029 in (Unknown)
Feb 05 22:41:42 /app/code/vhserver.sh: line 47: 106 Segmentation fault (core dumped) ./valheim_server.x86_64 -name $SERVERNAME -port $GAME_PORT -world $WORLDNAME -password $PASSWORD -savedir '/app/data/' -saveinterval $SAVEINTERVAL -backups $BACKUPS -backupshort $BACKUPSHORT -backuplong $BACKUPLONG -public $PUBLIC ${EXTRAPARAM:-}
Feb 05 22:41:42 2025-02-06 03:41:42,563 INFO exited: vhserver (exit status 139; not expected)

Here is the content of the mod folder:

.:
BepInEx  doorstop_config.ini  doorstop_libs  start_game_bepinex.sh  start_server_bepinex.sh  unstripped_corlib  winhttp.dll

./BepInEx:
config  core  plugins

./BepInEx/config:
BepInEx.cfg

./BepInEx/core:
0Harmony.dll    BepInEx.Harmony.dll    BepInEx.Preloader.xml  HarmonyXInterop.dll  Mono.Cecil.Rocks.dll       MonoMod.RuntimeDetour.xml
0Harmony.xml    BepInEx.Harmony.xml    BepInEx.dll            Mono.Cecil.Mdb.dll   Mono.Cecil.dll             MonoMod.Utils.dll
0Harmony20.dll  BepInEx.Preloader.dll  BepInEx.xml            Mono.Cecil.Pdb.dll   MonoMod.RuntimeDetour.dll  MonoMod.Utils.xml

./BepInEx/plugins:
ValheimPlus.dll

./doorstop_libs:
libdoorstop_x64.dylib  libdoorstop_x64.so  libdoorstop_x86.dylib  libdoorstop_x86.so

./unstripped_corlib:
Mono.Posix.dll                         UnityEngine.HotReloadModule.dll             UnityEngine.TilemapModule.dll
Mono.Security.dll                      UnityEngine.IMGUIModule.dll                 UnityEngine.UI.dll
System.Configuration.dll               UnityEngine.ImageConversionModule.dll       UnityEngine.UIElementsModule.dll
System.Core.dll                        UnityEngine.InputLegacyModule.dll           UnityEngine.UIModule.dll
System.Numerics.dll                    UnityEngine.InputModule.dll                 UnityEngine.UNETModule.dll
System.Security.dll                    UnityEngine.JSONSerializeModule.dll         UnityEngine.UmbraModule.dll
System.Xml.dll                         UnityEngine.LocalizationModule.dll          UnityEngine.UnityAnalyticsModule.dll
System.dll                             UnityEngine.ParticleSystemModule.dll        UnityEngine.UnityConnectModule.dll
UnityEngine.AIModule.dll               UnityEngine.PerformanceReportingModule.dll  UnityEngine.UnityTestProtocolModule.dll
UnityEngine.ARModule.dll               UnityEngine.Physics2DModule.dll             UnityEngine.UnityWebRequestAssetBundleModule.dll
UnityEngine.AccessibilityModule.dll    UnityEngine.PhysicsModule.dll               UnityEngine.UnityWebRequestAudioModule.dll
UnityEngine.AndroidJNIModule.dll       UnityEngine.ProfilerModule.dll              UnityEngine.UnityWebRequestModule.dll
UnityEngine.AnimationModule.dll        UnityEngine.ScreenCaptureModule.dll         UnityEngine.UnityWebRequestTextureModule.dll
UnityEngine.AssetBundleModule.dll      UnityEngine.SharedInternalsModule.dll       UnityEngine.UnityWebRequestWWWModule.dll
UnityEngine.AudioModule.dll            UnityEngine.SpriteMaskModule.dll            UnityEngine.VFXModule.dll
UnityEngine.ClothModule.dll            UnityEngine.SpriteShapeModule.dll           UnityEngine.VRModule.dll
UnityEngine.ClusterInputModule.dll     UnityEngine.StreamingModule.dll             UnityEngine.VehiclesModule.dll
UnityEngine.ClusterRendererModule.dll  UnityEngine.SubstanceModule.dll             UnityEngine.VideoModule.dll
UnityEngine.CoreModule.dll             UnityEngine.SubsystemsModule.dll            UnityEngine.WindModule.dll
UnityEngine.CrashReportingModule.dll   UnityEngine.TLSModule.dll                   UnityEngine.XRModule.dll
UnityEngine.DSPGraphModule.dll         UnityEngine.TerrainModule.dll               UnityEngine.dll
UnityEngine.DirectorModule.dll         UnityEngine.TerrainPhysicsModule.dll        mscorlib.dll
UnityEngine.GameCenterModule.dll       UnityEngine.TextCoreModule.dll
UnityEngine.GridModule.dll             UnityEngine.TextRenderingModule.dll

Could you please let me know if there is any missing configuration on my side?

Thank you for your time.

[nebulon]

Looks like one of the mods are not compatible with latests valheim server then. Maybe you can disable the mods one-by-one to find out which one is causing the crash.

[overclockmp]

Thank you for your answer.
Unfortunately, ValheimPlus is the only mod installed. I have tried this with a fresh installation too.

[nebulon]

@BrutalBirdie do you know more about this maybe?

[BrutalBirdie]

Try to set the latest version in the config: https://thunderstore.io/c/valheim/p/denikson/BepInExPack_Valheim/versions/

[overclockmp]

Thanks @BrutalBirdie. Unfortunately I am already using the latest version available on this website (i.e. 5.4.2202).

[BrutalBirdie]

Hmmm okay will investigate

[overclockmp]

Hi @brutalbirdie,

With some friends we recently went back to playing Valheim, so I went back to trying to setup Valheim Plus mod (or a newer version of it rather).

I had a couple issues before being actually successful. I wanted to put this here in case anyone needs this later on, even though this does not look like those were the same issues I had originally faced 1+ year ago.

I first changed the version of BepInEx to 5.4.2333 so that it matches to the closest version of the game mentioned in the ValheimPlus Changelogs:

Valheim 0.221.10 (n-36) + BepInExPack_Valheim 5.4.2333 + ValheimPlus 0.9.17.1

The game (client) is currently at 0.221.12 but this combination ended up working anyway.

However, after restarting the server, it remained stuck when unzipping bep.zip

May 17 14:07:25 Saving to: ‘bep.zip’
May 17 14:07:25 2026-05-17T18:07:25Z 
May 17 14:07:25 bep.zip               0%[                    ]       0  --.-KB/s               
bep.zip             100%[===================>] 721.87K  --.-KB/s    in 0.04s
May 17 14:07:25 2026-05-17T18:07:25Z 
May 17 14:07:25 2026-05-17 18:07:25 (17.6 MB/s) - ‘bep.zip’ saved [739197/739197]
May 17 14:07:25 2026-05-17T18:07:25Z 
May 17 14:07:26 Archive:  bep.zip

It seems that if there is already a bep.zip in /tmp, the script hangs here. I removed everything in /tmp and I was able to carry on.

The server started fine, but the mod did not load:

ay 17 14:40:50 05/17/2026 18:40:50: Console: Valheim l-0.221.12 (network version 36)
May 17 14:40:50 05/17/2026 18:40:50: Console: type "help" - for commands
May 17 14:40:50 05/17/2026 18:40:50: DungeonDB Awake 27227
May 17 14:40:50 05/17/2026 18:40:50: Worldgenerator version setup:2
May 17 14:40:50 05/17/2026 18:40:50: Zonesystem Awake 27227
May 17 14:40:50 05/17/2026 18:40:50: isModded: False

After a bit of troubleshooting with Claude, it seems that this new version of BepInEx uses Doorstop v4 which renamed some environment variables and removed some other ones. The old naming is still used in the vhserver.sh script.

So I cloned the valheim-gameserver-app repo, updated the env variables and pushed an update on my valheim cloudron app instance, which loaded the mod without any issues. You can find the lines I have changed below in vhserver.sh:

-export DOORSTOP_ENABLE=TRUE
-export DOORSTOP_INVOKE_DLL_PATH=./BepInEx/core/BepInEx.Preloader.dll
-export DOORSTOP_CORLIB_OVERRIDE_PATH=./unstripped_corlib
+# BepInExPack_Valheim 5.4.2333+ ships Doorstop v4, which renamed these env vars.
+export DOORSTOP_ENABLED=1
+export DOORSTOP_TARGET_ASSEMBLY=./BepInEx/core/BepInEx.Preloader.dll

[james]

Hello @overclockmp
Thanks for the detailed write-up, I will fix the package with your suggestions.