I am having a hard time resolving an error when I try to launch All the Mods 5 what am I not getting. I am new to all this and just trying to learn. I am a mac user by the way. 

 

Here is the crash report.....

 

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

Time: 2/4/20 6:36 PM
Description: Initializing game

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:78) ~[?:30.0] {re:classloading}
    at net.minecraftforge.fml.ModLoader.buildModContainerFromTOML(ModLoader.java:234) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.ModLoader.lambda$buildMods$26(ModLoader.java:214) ~[?:?] {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$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_74] {}
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_74] {}
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.ModLoader.buildMods(ModLoader.java:216) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$18(ModLoader.java:173) ~[?:?] {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$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_74] {}
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_74] {}
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:175) ~[?:?] {re:classloading}
    at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:393) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:screenshotclipboard:coremodone,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(SourceFile:164) ~[1.15.1-forge-30.0.51.jar:?] {re:classloading}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_74] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_74] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_74] {}
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) ~[forge-1.15.1-30.0.51.jar:30.0] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.jar:?] {}
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown Source) ~[?:?] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:30.0] {re:classloading}
    ... 35 more
Caused by: net.minecraftforge.fml.ModLoadingException: Client Tweaks has class loading errors
§7net/minecraftforge/fml/client/config/GuiSlider$ISlider
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.<init>(FMLModContainer.java:77) ~[?:30.0] {re:classloading}
    at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown Source) ~[?:?] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:30.0] {re:classloading}
    ... 35 more
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/fml/client/config/GuiSlider$ISlider
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642) ~[?:1.8.0_74] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:127) ~[modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96) ~[modlauncher-5.0.0-milestone.4.jar:?] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_74] {}
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74] {}
    at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.<init>(FMLModContainer.java:71) ~[?:30.0] {re:classloading}
    at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown Source) ~[?:?] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:30.0] {re:classloading}
    ... 35 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.client.config.GuiSlider$ISlider
    at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_74] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:101) ~[modlauncher-5.0.0-milestone.4.jar:?] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_74] {}
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642) ~[?:1.8.0_74] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:127) ~[modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96) ~[modlauncher-5.0.0-milestone.4.jar:?] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_74] {}
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_74] {}
    at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLModContainer.<init>(FMLModContainer.java:71) ~[?:30.0] {re:classloading}
    at sun.reflect.GeneratedConstructorAccessor32.newInstance(Unknown Source) ~[?:?] {}
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_74] {}
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_74] {}
    at net.minecraftforge.fml.javafmlmod.FMLJavaModLanguageProvider$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:73) ~[?:30.0] {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$FMLModTarget.loadMod(FMLJavaModLanguageProvider.java:78)
    at net.minecraftforge.fml.ModLoader.buildModContainerFromTOML(ModLoader.java:234)
    at net.minecraftforge.fml.ModLoader.lambda$buildMods$26(ModLoader.java:214)
    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$ReduceOp.evaluateSequential(ReduceOps.java:708)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
    at net.minecraftforge.fml.ModLoader.buildMods(ModLoader.java:216)
    at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$18(ModLoader.java:173)
    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$ReduceOp.evaluateSequential(ReduceOps.java:708)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
    at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:175)
    at net.minecraftforge.fml.client.ClientModLoader.lambda$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.<init>(Minecraft.java:393)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.main.Main.main(SourceFile:164)
    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: 1.15.1
    Minecraft Version ID: 1.15.1
    Operating System: Mac OS X (x86_64) version 10.15.3
    Java Version: 1.8.0_74, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 8673883656 bytes (8272 MB) / 10569646080 bytes (10080 MB) up to 10737418240 bytes (10240 MB)
    CPUs: 4
    JVM Flags: 8 total; -Xss1M -Xmx10G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    ModLauncher: 5.0.0-milestone.4+67+b1a340b
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services: 
        /eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.1-30.0.51.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.1-30.0.51.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-2.0.0-milestone.1-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.1-30.0.51.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.15.1-30.0.51.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.15.1-30.0.51.jar fml TRANSFORMATIONSERVICE 
    FML: 30.0
    Forge: net.minecraftforge:30.0.51
    FML Language Providers: 
        [email protected]
        minecraft@1
        [email protected]
    Mod List: ~~ERROR~~ NullPointerException: null
    Launched Version: 1.15.1-forge-30.0.51
    Backend library: LWJGL version 3.2.1 build 12
    Backend API: Intel(R) Iris(TM) Graphics 6100 GL version 2.1 INTEL-14.4.23, 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) i7-5557U CPU @ 3.10GHz

Thank you for that information. I have done that and then I get this error (find below / attached). Any help would be great. 

 

 

 

Error#2.docx