So, my friend and I just downloaded and installed forge obviously because we both want to mod. His is working fine after crashing a couple times, but for whatever reason every time I try to start minecraft after the launch it just crashes. I definitely have it installed, the user is set to forge, but it still just won't work.

 

this is the log:

 

---- Minecraft Crash Report ----

 

WARNING: coremods are present:

Contact their authors BEFORE contacting forge

 

// There are four lights!

 

Time: 11/15/16 7:36 PM

Description: Initializing game

 

java.lang.ArithmeticException: / by zero

at net.minecraft.client.renderer.texture.TextureMap.func_110571_b(TextureMap.java:260)

at net.minecraft.client.renderer.texture.TextureMap.func_174943_a(TextureMap.java:146)

at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:155)

at net.minecraft.client.renderer.block.model.ModelManager.func_110549_a(ModelManager.java:28)

at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:122)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:575)

at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:428)

at net.minecraft.client.main.Main.main(SourceFile:124)

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:483)

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

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

 

 

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

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

 

-- Head --

Thread: Client thread

Stacktrace:

at net.minecraft.client.renderer.texture.TextureMap.func_110571_b(TextureMap.java:260)

at net.minecraft.client.renderer.texture.TextureMap.func_174943_a(TextureMap.java:146)

at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:155)

at net.minecraft.client.renderer.block.model.ModelManager.func_110549_a(ModelManager.java:28)

at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:122)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:575)

 

-- Initialization --

Details:

Stacktrace:

at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:428)

at net.minecraft.client.main.Main.main(SourceFile:124)

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:483)

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

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

 

-- System Details --

Details:

Minecraft Version: 1.10.2

Operating System: Windows 8.1 (amd64) version 6.3

Java Version: 1.8.0_25, Oracle Corporation

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

Memory: 186125464 bytes (177 MB) / 344190976 bytes (328 MB) up to 1060372480 bytes (1011 MB)

JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M

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

FML:

Loaded coremods (and transformers):

Launched Version: 1.10.2-forge1.10.2-12.18.0.2010

LWJGL: 2.9.4

OpenGL: AMD Radeon HD 8400 GL version 4.2.12422 Compatibility Profile Context 13.152.1.3000, ATI Technologies Inc.

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: Dandelion_4.zip (incompatible)

Current Language: English (US)

Profiler Position: N/A (disabled)

CPU: 4x AMD A6-5200 APU with Radeon HD Graphics

OptiFine Version: OptiFine_1.10.2_HD_U_C1_pre

Render Distance Chunks: 32

Mipmaps: 4

Anisotropic Filtering: 1

Antialiasing: 0

Multitexture: false

Shaders: null

OpenGlVersion: 4.2.12422 Compatibility Profile Context 13.152.1.3000

OpenGlRenderer: AMD Radeon HD 8400

OpenGlVendor: ATI Technologies Inc.

CpuCount: 4

 

I have no idea what any of this means, so help would be greatly appreciated!! note: i have nothing else installed other than a texture pack, so basically vanilla minecraft, and i'm using forge version 1.10.2

UPDATE: just realised i had optifine installed. Kind of feel like a dumbass, lmao. I got rid of it and it appears  to be working now... I guess I'll update if it stops.