I have just build the forge 1.14.2 mdk. Homever as soon as I run runClient minecraft opens and crashes as soon as the mainmenu opens.
 

---- Minecraft Crash Report ----
// Why did you do that?

Time: 09.06.19 15:17
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
	at net.minecraftforge.fml.ModList.size(ModList.java:164) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:eventbus:A,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraftforge.fml.BrandingControl.computeBranding(BrandingControl.java:59) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:eventbus:A,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraftforge.fml.BrandingControl.getBrandings(BrandingControl.java:68) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:eventbus:A,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraftforge.fml.BrandingControl.forEachLine(BrandingControl.java:77) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:eventbus:A,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screen.MainMenuScreen.render(MainMenuScreen.java:257) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:358) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:eventbus:A,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.updateCameraAndRender(GameRenderer.java:569) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:accesstransformer:B,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:933) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:accesstransformer:B,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:384) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:accesstransformer:B,pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:127) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {pl:object_holder_definalize:A,pl:runtime_enum_extender:A,pl:capability_inject_definalize:A,pl:runtimedistcleaner:A}
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_201] {}
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_201] {}
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_201] {}
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_201] {}
	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:19) [modlauncher-2.1.1.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:32) [modlauncher-2.1.1.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:50) [modlauncher-2.1.1.jar:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:59) [modlauncher-2.1.1.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:44) [modlauncher-2.1.1.jar:?] {}
	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:98) [forge-1.14.2-26.0.12_mapped_snapshot_20190608-1.14.2-recomp.jar:?] {}


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

-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraftforge.fml.ModList.size(ModList.java:164)
	at net.minecraftforge.fml.BrandingControl.computeBranding(BrandingControl.java:59)
	at net.minecraftforge.fml.BrandingControl.getBrandings(BrandingControl.java:68)
	at net.minecraftforge.fml.BrandingControl.forEachLine(BrandingControl.java:77)
	at net.minecraft.client.gui.screen.MainMenuScreen.render(MainMenuScreen.java:257)
	at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:358)

-- Screen render details --
Details:
	Screen name: net.minecraft.client.gui.screen.MainMenuScreen
	Mouse location: Scaled: (0, 0). Absolute: (0.000000, 0.000000)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2.000000
Stacktrace:
	at net.minecraft.client.renderer.GameRenderer.updateCameraAndRender(GameRenderer.java:569)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:933)
	at net.minecraft.client.Minecraft.run(Minecraft.java:384)
	at net.minecraft.client.main.Main.main(Main.java:127)
	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.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55)
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:19)
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:32)
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:50)
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:59)
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:44)
	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:98)

-- System Details --
Details:
	Minecraft Version: 1.14.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_201, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 594227512 bytes (566 MB) / 1890058240 bytes (1802 MB) up to 3806855168 bytes (3630 MB)
	JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	FML: New FML!
	Loaded coremods (and transformers): Nothing
	Launched Version: MOD_DEV
	LWJGL: 3.2.1 build 12
	OpenGL: GeForce GTX 1080/PCIe/SSE2 GL version 4.6.0 NVIDIA 430.64, NVIDIA Corporation
	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 'forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	CPU: 16x AMD Ryzen 7 2700X Eight-Core Processor 

 

Edited June 9, 20196 yr by Kuqs

Post your mods.toml file. You've probably forgotten to change "1.13.2" to "1.14.2" and update your forge version from "25" to "26"