So, I've decided to start my mod again from scratch since 1.9 was out. I create an intem (without texture yet) and I get this crash (I've read it, but can't find where I did wrong).

Source code: https://github.com/Velken/PotatiumCraft

 

---- Minecraft Crash Report ----

// I feel sad now

 

Time: 02/05/16 00:38

Description: Initializing game

 

java.lang.IllegalArgumentException: Multiple entries with same key: potatiumcraft=FMLMod:potatiumcraft{1.9-0.0.1} and potatiumcraft=FMLMod:potatiumcraft{1.9-0.0.1}

at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)

at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)

at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)

at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)

at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166)

at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140)

at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:365)

at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:488)

at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:205)

at net.minecraft.client.Minecraft.startGame(Minecraft.java:472)

at net.minecraft.client.Minecraft.run(Minecraft.java:381)

at net.minecraft.client.main.Main.main(Main.java:118)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)

at GradleStart.main(GradleStart.java:26)

 

 

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

 

-- Head --

Stacktrace:

at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)

at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)

at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)

at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)

at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166)

at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140)

at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:365)

at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:488)

at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:205)

at net.minecraft.client.Minecraft.startGame(Minecraft.java:472)

 

-- Initialization --

Details:

Stacktrace:

at net.minecraft.client.Minecraft.run(Minecraft.java:381)

at net.minecraft.client.main.Main.main(Main.java:118)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)

at GradleStart.main(GradleStart.java:26)

 

-- System Details --

Details:

Minecraft Version: 1.9

Operating System: Windows 7 (amd64) version 6.1

Java Version: 1.8.0_73, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 105618768 bytes (100 MB) / 402653184 bytes (384 MB) up to 708837376 bytes (676 MB)

JVM Flags: 0 total;

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

FML: MCP 9.23 Powered by Forge 12.16.0.1868 5 mods loaded, 0 mods active

States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)

FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.9-12.16.0.1868-1.9.jar)

Forge{12.16.0.1868} [Minecraft Forge] (forgeSrc-1.9-12.16.0.1868-1.9.jar)

potatiumcraft{1.9-0.0.1} [Potatium Craft] (modid-1.0.jar)

potatiumcraft{1.9-0.0.1} [Potatium Craft] (modid-1.0.jar)

Loaded coremods (and transformers):

GL info: ' Vendor: 'Intel' Version: '2.1.0 - Build 8.15.10.2869' Renderer: 'Mobile Intel® 4 Series Express Chipset Family'

Launched Version: 1.9

LWJGL: 2.9.4

OpenGL: Mobile Intel® 4 Series Express Chipset Family GL version 2.1.0 - Build 8.15.10.2869, Intel

GL Caps: Using GL 1.3 multitexturing.

Using GL 1.3 texture combiners.

Using framebuffer objects because EXT_framebuffer_object is supported.

Shaders are available because OpenGL 2.1 is supported.

VBOs are available because OpenGL 1.5 is supported.

 

Using VBOs: No

Is Modded: Definitely; Client brand changed to 'fml,forge'

Type: Client (map_client.txt)

Resource Packs:

Current Language: English (US)

Profiler Position: N/A (disabled)

CPU: 2x Pentium® Dual-Core CPU T4500 @ 2.30GHz

 

java.lang.IllegalArgumentException: Multiple entries with same key: potatiumcraft=FMLMod:potatiumcraft{1.9-0.0.1} and potatiumcraft=FMLMod:potatiumcraft{1.9-0.0.1}

  at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)

  at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)

  at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)

  at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)

  at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166)

  at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140)

  at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:365)

  at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:488)

 

You've somehow managed to create two compiled classes annotated with

@Mod

using the same mod ID. Only one of these is present in your source code, so I suggest running the

clean

Gradle task and then re-running Minecraft.

 

Your item/model registration code is quite messy and outdated. I explain how to properly register items and their models in 1.9 here.

Thank you Choonster, I've found little tutorials out there that were, somewhat, comprehensible. I really need to get out this rust on my programming skills.

And running clean Gradle workded