I'm trying to play this mod but when I open forge minecraft I get exit code 1. I only have this mod and forgerocks installed.

Here's the log:
[20:42:11] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker [20:42:11] [main/INFO]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker [20:42:11] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker [20:42:11] [main/INFO]: Forge Mod Loader version 14.23.5.2859 for Minecraft 1.12.2 loading [20:42:11] [main/INFO]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Users\Araraura\curseforge\minecraft\Install\runtime\jre-legacy\windows-x64\jre-legacy [20:42:11] [main/INFO]: Searching C:\Users\Araraura\curseforge\minecraft\Instances\farplane2\mods for mods [20:42:11] [main/INFO]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from fp2-0.0.1.612-1.12.2.jar [20:42:11] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker [20:42:11] [main/INFO]: Loading tweak class name org.spongepowered.asm.launch.MixinTweaker [20:42:11] [main/ERROR]: Unable to launch java.lang.ClassNotFoundException: org.spongepowered.asm.launch.MixinTweaker at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_51] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[?:1.8.0_51] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_51] at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_51] at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49) [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761) [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107) [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971) [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138) [20:42:11] [main/INFO]: [java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

On 1.12.2, you also need to manually install Mixin.