dan4

I know, its that specific problem I am trying to solve. Could it have something to do with gradle? I can run the code fine in IntelliJ but when I build a jar is when i get the aformentioned crash report.

Here is my crash report, can't figure it out from here. ---- Minecraft Crash Report ---- // You're mean. Time: 5/25/18 7:24 PM Description: Initializing game java.lang.NoClassDefFoundError: kotlin/jvm/internal/Intrinsics at net.shadowfacts.tutorial.TutorialMod$ObjectRegistryHandler.registerBlocks(TutorialMod.kt) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_4_ObjectRegistryHandler_registerBlocks_Register.invoke(.dynamic) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:143) at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:686) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:671) at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:605) at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:266) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:466) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377) at net.minecraft.client.main.Main.main(SourceFile:123) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: java.lang.ClassNotFoundException: kotlin.jvm.internal.Intrinsics at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 18 more Caused by: java.lang.NullPointerException at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ... 20 more A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Client thread Stacktrace: at net.shadowfacts.tutorial.TutorialMod$ObjectRegistryHandler.registerBlocks(TutorialMod.kt) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_4_ObjectRegistryHandler_registerBlocks_Register.invoke(.dynamic) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:143) at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:686) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:671) at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:605) at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:266) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:466) -- Initialization -- Details: Stacktrace: at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377) at net.minecraft.client.main.Main.main(SourceFile:123) 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:498) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) -- System Details -- Details: Minecraft Version: 1.12 Operating System: Linux (amd64) version 4.14.11-300.fc27.x86_64 Java Version: 1.8.0_161, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 125320464 bytes (119 MB) / 318885888 bytes (304 MB) up to 1060372480 bytes (1011 MB) JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP 9.40 Powered by Forge 14.21.1.2387 6 mods loaded, 6 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored UCH minecraft{1.12} [Minecraft] (minecraft.jar) UCH mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) UCH FML{8.0.99.99} [Forge Mod Loader] (forge-1.12-14.21.1.2387.jar) UCH forge{14.21.1.2387} [Minecraft Forge] (forge-1.12-14.21.1.2387.jar) UCH mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.12.jar) UCH tutorial{1.0} [TutorialMod] (mymod-1.0-SNAPSHOT.jar) Loaded coremods (and transformers): GL info: ' Vendor: 'Intel Open Source Technology Center' Version: '3.0 Mesa 17.2.4' Renderer: 'Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) ' Launched Version: 1.12-forge1.12-14.21.1.2387 LWJGL: 2.9.4 OpenGL: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) GL version 3.0 Mesa 17.2.4, Intel Open Source Technology Center GL Caps: Using GL 1.3 multitexturing. Using GL 1.3 texture combiners. Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported. Shaders are available because OpenGL 2.1 is supported. VBOs are available because OpenGL 1.5 is supported. Using VBOs: Yes 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: 4x Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz

It may or may not require permission, that would depend on the license wouldn't it? Normally, it's as long as credit is given where it is due AND publishing thew modified code, then it should(hopefully) be fine. Can't say for sure though, it varies.