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Here's the problem-

Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
[20:50:15] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[20:50:15] [main/INFO] [FML]: Forge Mod Loader version 11.15.1.1902 for Minecraft 1.8.9 loading
[20:50:15] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_74, running on Mac OS X:x86_64:10.10.5, installed at /Applications/Minecraft.app/Contents/runtime/jre-x64/1.8.0_74
[20:50:15] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:50:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:50:17] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[20:50:17] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[20:50:17] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:50:17] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:50:18] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[20:50:18] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[20:50:18] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[20:50:18] [main/INFO] [STDOUT]: [net.minecraft.client.main.Main:main:57]: Completely ignored arguments: [--nativeLauncherVersion, 308]
[20:50:19] [Client thread/INFO]: Setting user: daj1999
[20:50:19] [Client thread/ERROR] [LaunchWrapper]: Unable to launch
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_74]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_74]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_74]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_74]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213) ~[guava-17.0.jar:?]
at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767) ~[guava-17.0.jar:?]
at com.google.common.collect.Lists.reverse(Lists.java:759) ~[guava-17.0.jar:?]
at net.minecraft.server.management.PlayerProfileCache.func_152657_b(SourceFile:156) ~[lt.class:?]
at net.minecraft.server.management.PlayerProfileCache.<init>(SourceFile:43) ~[lt.class:?]
at net.minecraft.server.MinecraftServer.<init>(MinecraftServer.java:151) ~[MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:47) ~[bpo.class:?]
at net.minecraft.client.Minecraft.<init>(Minecraft.java:311) ~[ave.class:?]
at net.minecraft.client.main.Main.main(SourceFile:124) ~[Main.class:?]
... 6 more
Exception in thread "Client thread" [20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:30)
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971)
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[20:50:19] [Client thread/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

What can I do? I'm on a Macbook Pro

Try to reinstall minecraft.