Every time I hit the play button on the launcher the game crashes
at first I had some bigish mods installed (most notably botania and tinkers construct) but even after I took out all other mods I still got the same crash.
This log makes no sense to me but maybe someone can make sense of it?

2017-01-07 18:01:03,709 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2017-01-07 18:01:03,715 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[18:01:03] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:01:03] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:01:03] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[18:01:04] [main/INFO] [FML]: Forge Mod Loader version 12.18.3.2202 for Minecraft 1.10.2 loading
[18:01:04] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:\Users\Chris\Desktop\Games\Minecraft\runtime\jre-x64\1.8.0_25
[18:01:04] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:01:04] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[18:01:04] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:01:04] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:01:04] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[18:01:10] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[18:01:10] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[18:01:10] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[18:01:10] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
Exception in thread "main" [18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.NoClassDefFoundError: codechicken/lib/asm/ModularASMTransformer$ClassNodeTransformer
[18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.getDeclaredConstructors0(Native Method)
[18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.privateGetDeclaredConstructors(Class.java:2663)
[18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.getConstructor0(Class.java:3067)
[18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.newInstance(Class.java:408)
[18:01:10] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.(ASMTransformerWrapper.java:237)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at $wrapper.com.brandon3055.brandonscore.asm.ClassTransformer.(Unknown Source)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Class.newInstance(Class.java:438)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.LaunchClassLoader.registerTransformer(LaunchClassLoader.java:88)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:131)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.ClassNotFoundException: codechicken.lib.asm.ModularASMTransformer$ClassNodeTransformer
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[18:01:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: ... 15 more
[18:01:11] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: Caused by: java.lang.NullPointerException
[18:01:11] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[18:01:11] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:643]: ... 17 more

Can you post the full log on pastebin and then post a link? Right now the bit you provided looks like you are missing codechicken lib. you have to download that manually.

Yes, Ensure you have the latest CCL from curse installed in your mods directory.