I havent played in a while and updated all mod packs and resource packs that required updating, after i updated everything when i would launch the mod it would crash?

 

[12:20:57] [main/ERROR]:Found duplicate mods:

Mod ID: 'rubidium' from mod files: xenon-0.3.31+mc1.20.1.jar, embeddium-0.3.31+mc1.20.1.jar

Mod ID: 'embeddium' from mod files: xenon-0.3.31+mc1.20.1.jar, embeddium-0.3.31+mc1.20.1.jar

[12:20:57] [main/ERROR]:Failed to build unique mod list after mod discovery.

net.minecraftforge.fml.loading.EarlyLoadingException: Duplicate mods found

at net.minecraftforge.fml.loading.UniqueModListBuilder.buildUniqueList(UniqueModListBuilder.java:87) ~[fmlloader-1.20.1-47.3.7.jar:1.0]

at net.minecraftforge.fml.loading.moddiscovery.ModDiscoverer.discoverMods(ModDiscoverer.java:106) ~[fmlloader-1.20.1-47.3.7.jar:?]

at net.minecraftforge.fml.loading.FMLLoader.beginModScan(FMLLoader.java:164) ~[fmlloader-1.20.1-47.3.7.jar:1.0]

at net.minecraftforge.fml.loading.FMLServiceProvider.beginScanning(FMLServiceProvider.java:86) ~[fmlloader-1.20.1-47.3.7.jar:1.0]

at cpw.mods.modlauncher.TransformationServiceDecorator.runScan(TransformationServiceDecorator.java:112) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.TransformationServicesHandler.lambda$runScanningTransformationServices$8(TransformationServicesHandler.java:100) ~[modlauncher-10.0.9.jar:?]

at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]

at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1779) ~[?:?]

at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]

at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]

at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575) ~[?:?]

at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260) ~[?:?]

at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616) ~[?:?]

at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:622) ~[?:?]

at java.util.stream.ReferencePipeline.toList(ReferencePipeline.java:627) ~[?:?]

at cpw.mods.modlauncher.TransformationServicesHandler.runScanningTransformationServices(TransformationServicesHandler.java:102) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:55) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.Launcher.run(Launcher.java:88) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?]

at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?]

[12:20:57] [main/ERROR]:Mod Discovery failed. Skipping dependency discovery.

Edited August 20, 20251 yr by Astrosities

4 hours ago, Astrosities said:

Mod ID: 'embeddium' from mod files: xenon-0.3.31+mc1.20.1.jar, embeddium-0.3.31+mc1.20.1.jar

These 2 mods are the same, remove one of them.