When I launch the game this happens I don't know what causes it.
If it matters, I play on a mac.

Please send your crash report

Any reason to use Forge 31.2.0?

No, it was the recommended version.

Try 31.2.30

that worked, thanks.

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 16/08/20 11:02
Description: Initializing game

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:78) ~[?:31.2] {re:classloading}
at net.minecraftforge.fml.ModLoader.buildModContainerFromTOML(ModLoader.java:251) ~[?:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.lambda$buildMods$27(ModLoader.java:231) ~[?:?] {re:classloading}
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_74] {}
at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1683) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_74] {}
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_74] {}
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.ModLoader.buildMods(ModLoader.java:233) ~[?:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$19(ModLoader.java:189) ~[?:?] {re:classloading}
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_74] {}
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_74] {}
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_74] {}
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_74] {}
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_74] {}
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:191) ~[?:?] {re:classloading}
at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.(Minecraft.java:392) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(SourceFile:166) ~[1.15.2-forge-31.2.0.jar:?] {re:classloading}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_74] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_74] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_74] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) ~[forge-1.15.2-31.2.0.jar:31.2] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.1.0.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.1.0.jar:?] {re:classloading}
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedConstructorAccessor40.newInstance(Unknown Source) ~[?:?] {}
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:31.2] {re:classloading}
... 35 more
Caused by: net.minecraftforge.fml.ModLoadingException: RandomPatches has class loading errors
§7java.lang.NoClassDefFoundError: net/minecraftforge/fml/DistExecutor$SafeSupplier
at net.minecraftforge.fml.javafmlmod.FMLModContainer.(FMLModContainer.java:77) ~[?:31.2] {re:classloading}
at sun.reflect.GeneratedConstructorAccessor40.newInstance(Unknown Source) ~[?:?] {}
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:31.2] {re:classloading}
... 35 more
Caused by: java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: net/minecraftforge/fml/DistExecutor$SafeSupplier
at com.therandomlabs.randompatches.RandomPatches.(RandomPatches.java:18) ~[?:1.15.2-1.22.1.1] {re:classloading}
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74] {}
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.(FMLModContainer.java:71) ~[?:31.2] {re:classloading}
at sun.reflect.GeneratedConstructorAccessor40.newInstance(Unknown Source) ~[?:?] {}
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:31.2] {re:classloading}
... 35 more
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/fml/DistExecutor$SafeSupplier
at com.therandomlabs.randompatches.RandomPatches.(RandomPatches.java:18) ~[?:1.15.2-1.22.1.1] {re:classloading}
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74] {}
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.(FMLModContainer.java:71) ~[?:31.2] {re:classloading}
at sun.reflect.GeneratedConstructorAccessor40.newInstance(Unknown Source) ~[?:?] {}
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:31.2] {re:classloading}
... 35 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.DistExecutor$SafeSupplier
at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_74] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_74] {}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:101) ~[modlauncher-5.1.0.jar:?] {re:classloading}
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_74] {}
at com.therandomlabs.randompatches.RandomPatches.(RandomPatches.java:18) ~[?:1.15.2-1.22.1.1] {re:classloading}
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74] {}
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.(FMLModContainer.java:71) ~[?:31.2] {re:classloading}
at sun.reflect.GeneratedConstructorAccessor40.newInstance(Unknown Source) ~[?:?] {}
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:31.2] {re:classloading}
... 35 more

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

-- Head --
Thread: Render thread
Stacktrace:
at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:78)
at net.minecraftforge.fml.ModLoader.buildModContainerFromTOML(ModLoader.java:251)
at net.minecraftforge.fml.ModLoader.lambda$buildMods$27(ModLoader.java:231)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1683)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at net.minecraftforge.fml.ModLoader.buildMods(ModLoader.java:233)
at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$19(ModLoader.java:189)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:191)
at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97)
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113)
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97)
at net.minecraft.client.Minecraft.(Minecraft.java:392)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.main.Main.main(SourceFile:166)
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:498)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

-- System Details --
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
Operating System: Mac OS X (x86_64) version 10.15.4
Java Version: 1.8.0_74, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 4120036544 bytes (3929 MB) / 6174015488 bytes (5888 MB) up to 6442450944 bytes (6144 MB)
CPUs: 4
JVM Flags: 8 total; -Xss1M -Xmx6G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
ModLauncher: 5.1.0+69+master.79f13f7
ModLauncher launch target: fmlclient
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.2.0-service.jar eventbus PLUGINSERVICE
/forge-1.15.2-31.2.0.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.2-31.2.0.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.2-31.2.0.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.2-31.2.0.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.2-31.2.0.jar fml TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.3.jar mixinbootstrap TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.3.jar mixin PLUGINSERVICE
/MixinBootstrap-1.0.3.jar mixinbootstrap PLUGINSERVICE
FML: 31.2
Forge: net.minecraftforge:31.2.0
FML Language Providers:
[email protected]
minecraft@1
Mod List: ERROR NullPointerException: null
Launched Version: 1.15.2-forge-31.2.0
Backend library: LWJGL version 3.2.1 build 12
Backend API: Intel(R) UHD Graphics 617 GL version 2.1 INTEL-14.5.22, Intel Inc.
GL Caps: Using framebuffer using ARB_framebuffer_object extension
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'forge'
Type: Client (map_client.txt)
CPU: 4x Intel(R) Core(TM) i5-8210Y CPU @ 1.60GHz