Minecraft CurseForge

I was trying to play a mudpack I downloaded and instant crash. I maybe had a second or two before it went down.

Any idea of how I could fix this?

Here's what it said:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 7/4/16 12:06 AM
Description: FML will not run in demo mode

java.lang.RuntimeException
 at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:201)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
 at net.minecraft.client.main.Main.main(SourceFile:148)
 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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
 Minecraft Version: 1.7.10
 Operating System: Windows 8.1 (amd64) version 6.3
 Java Version: 1.8.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 279390320 bytes (266 MB) / 609222656 bytes (581 MB) up to 3817865216 bytes (3641 MB)
 JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms256m -XX:PermSize=256m
 AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML:
 GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.2.12422 Compatibility Profile Context 13.152.1.1000' Renderer: 'AMD Radeon HD 8570D'

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 7/4/16 12:06 AM
Description: FML will not run in demo mode

java.lang.RuntimeException
 at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:201)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
 at net.minecraft.client.main.Main.main(SourceFile:148)
 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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
 Minecraft Version: 1.7.10
 Operating System: Windows 8.1 (amd64) version 6.3
 Java Version: 1.8.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 279390320 bytes (266 MB) / 609222656 bytes (581 MB) up to 3817865216 bytes (3641 MB)
 JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms256m -XX:PermSize=256m
 AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML:
 GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.2.12422 Compatibility Profile Context 13.152.1.1000' Renderer: 'AMD Radeon HD 8570D'

Wait, figured it out, never mind, sorry for posting this.