Crash Assistant doesn't work if RingsOfAscension installed.

[rumugius]

files:

app_start_error.txt
crash_assistant_app.log

.txt:

CrashAssistantApp process failed to start due to errors below:
Crash Assistant won't work.
This won't cause any issues to the main game process, just Crash Assistant won't popup after crash.
Please report to https:\github.com\KostromDan\Crash-Assistant\issues
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at dev.kostromdan.mods.crash_assistant.app.class_loading.Boot.main(Boot.java:129)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
at dev.kostromdan.mods.crash_assistant.app.utils.FileUtils.removeOldLogsFolder(FileUtils.java:37)
at dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp.main(CrashAssistantApp.java:122)
... 3 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more

.log:

[2026-01-13 05:14:57.183] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: CrashAssistantApp running: JVM args: [-XX:+UseSerialGC, -XX:MaxHeapFreeRatio=30, -XX:MinHeapFreeRatio=10, -XX:MaxGCPauseMillis=10000, -Xms8m, -Xmx512m]
[2026-01-13 05:14:57.185] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: CrashAssistantApp running: program args: [-jarPath, local\crash_assistant\17756_1768270493147_app.jar, -parentPID, 17756, -parentStarted, 1768270493147, -platform, FABRIC, -loaderJarName, fabric-loader-0.18.4.jar, -minecraftVersion, 1.20.1, -childProcessesPIDs, VU5ERUZJTkVE, -crashAssistantModJarName, CrashAssistant-fabric-1.19-1.21.4-1.10.28.jar, -classPath, local\crash_assistant\17756_1768270493147_app.jar;local\crash_assistant\17756_1768270493147_mod.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\libraries\org\apache\logging\log4j\log4j-api\2.19.0\log4j-api-2.19.0.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\libraries\org\apache\logging\log4j\log4j-core\2.19.0\log4j-core-2.19.0.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\libraries\com\google\code\gson\gson\2.10\gson-2.10.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\profiles\asdfghjkl;\mods\RingsOfAscension-1.20.1-2.0.2.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\libraries\net\java\dev\jna\jna\5.12.1\jna-5.12.1.jar;C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\libraries\net\java\dev\jna\jna-platform\5.12.1\jna-platform-5.12.1.jar, -parentXms, unknown, -parentXmx, 8192M, -systemRAM, 31.9g, -processor, SW50ZWwoUikgQ29yZShUTSkgaTctODcwMEsgQ1BVIEAgMy43MEdIeg==, -serialisedGPUs, VnVsa2FuIEdQVSBkZXRlY3Rpb24gYWRkb24gbm90IGZvdW5kLCBmYWxsaW5nIGJhY2sgdG8gRGlyZWN0WApTdWNjZXNzZnVsbHkgZGV0ZWN0ZWQgR1BVcyB1c2luZyBEaXJlY3RYOgpERURJQ0FURUQgOiBOVklESUEgR2VGb3JjZSBSVFggNDA3MCBUaQoNCg==]
[2026-01-13 05:14:57.187] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: CrashAssistantApp running from: C:\Users\Professional\AppData\Roaming\ModrinthApp\profiles\asdfghjkl;
[2026-01-13 05:14:57.187] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: crashAssistantJarName: CrashAssistant-fabric-1.19-1.21.4-1.10.28.jar
[2026-01-13 05:14:57.187] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Parent PID: 17756
[2026-01-13 05:14:57.187] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Parent started: 1768270493147
[2026-01-13 05:14:57.189] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Platform: FABRIC
[2026-01-13 05:14:57.190] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: loaderJarName: fabric-loader-0.18.4.jar
[2026-01-13 05:14:57.190] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: minecraftVersion: 1.20.1
[2026-01-13 05:14:57.190] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: childProcessesPIDs: UNDEFINED
[2026-01-13 05:14:57.190] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: parentXms: unknown
[2026-01-13 05:14:57.190] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: parentXmx: 8192M
[2026-01-13 05:14:57.191] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: systemRAM: 31.9g
[2026-01-13 05:14:57.191] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: processor: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
[2026-01-13 05:14:57.191] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Boot.serialisedGPUs:
Vulkan GPU detection addon not found, falling back to DirectX
Successfully detected GPUs using DirectX:
DEDICATED : NVIDIA GeForce RTX 4070 Ti
[2026-01-13 05:14:57.191] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: os.name: windows 11
[2026-01-13 05:14:57.195] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Java path: C:\Users\Professional\AppData\Roaming\ModrinthApp\meta\java_versions\zulu21.46.19-ca-jre21.0.9-win_x64\bin\javaw.exe
[2026-01-13 05:14:57.195] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Java version: 21.0.9+10-LTS

[KostromDan]

Please also provide game log.

[rumugius]

latest.log

[KostromDan]

This log doesn't have this issue.
In this log crash assistant process started successfully.

[rumugius]

it started:

[05:31:29] [CrashAssistantApp process logger/INFO]: CrashAssistantApp process successfully started.

but kinda didn't:

[05:31:31] [Timer-1/ERROR]: CrashAssistantApp process failed to start due to errors below:
Crash Assistant won't work.

[KostromDan]

Overlooked it.

Okay, the reason why it happened was because RingsOfAscension-1.20.1-2.0.2.jar ships in fatJar different version of org.apache.commons.io. This lib is part of Minecraft distribution and mod owerriden library provided by Minecraft with an old version of this library.
Fabric decided to load lib not which minecraft provides, but very old version of it from that mod.
They ship different very old version of it. So it broke Crash Assistant and could break tons of other things.

Will think what to do.

[Poopooracoocoo]

@rumugius could you please use a code block inside a collapsible section (by doing /details) for your log? Or just remove it since you've attached it as a file? It's hard to read through this issue.