I was testing if a custom modpack i was working on, would run well on Mac and when i tried to start Minecraft the following error appeared:

(Already tried it with every modversion of 1.19.2)

-- Head --
Thread: Render thread
Stacktrace:
at net.sweenus.simplyswords.SimplySwords.init(SimplySwords.java:44) ~[simplyswords-forge-1.43.0-1.19.2.jar%23351!/:?] {re:classloading}
-- MOD simplyswords --
Details:
Caused by 0: java.lang.reflect.InvocationTargetException
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {re:mixin}
at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {re:mixin}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:68) ~[javafmllanguage-1.19.2-43.2.4.jar%23382!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:121) ~[fmlcore-1.19.2-43.2.4.jar%23381!/:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {re:mixin}

Mod File: /Users/kilianforberg/Desktop/AT Launcher/ATLauncher.app/Contents/Java/instances/Minecraft1192withForge/mods/simplyswords-forge-1.43.0-1.19.2.jar
Failure message: Simply Swords (simplyswords) has failed to load correctly
	java.lang.reflect.InvocationTargetException: null
Mod Version: 1.43.0-1.19.2
Mod Issue URL: https://github.com/Sweenus/SimplySwords/issues
Exception message: java.lang.NullPointerException: Cannot invoke "com.google.gson.JsonObject.has(String)" because "json" is null

Stacktrace:
at net.sweenus.simplyswords.SimplySwords.init(SimplySwords.java:44) ~[simplyswords-forge-1.43.0-1.19.2.jar%23351!/:?] {re:classloading}
at net.sweenus.simplyswords.forge.SimplySwordsForge.(SimplySwordsForge.java:18) ~[simplyswords-forge-1.43.0-1.19.2.jar%23351!/:?] {re:classloading}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {re:mixin}
at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {re:mixin}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:68) ~[javafmllanguage-1.19.2-43.2.4.jar%23382!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:121) ~[fmlcore-1.19.2-43.2.4.jar%23381!/:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:mixin,re:computing_frames}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {re:mixin}

Hi there,

If you remove Simply Swords from the modpack and try to launch, does it boot correctly?

Yes, without the mod on mac everything loads as intended. On Windows in it works both ways.

Thank you. Can I also ask if the crash ocurrs with only Simply Swords and its dependencies installed?

Hi there, I am also on a mac and on 1.18.2 and experiencing the same crash. Simplyswords failed to load correctly (null)
crash-2023-02-25_02.57.23-fml.txt

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 2/25/23, 2:57 AM
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
at net.minecraftforge.logging.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:55) ~[forge-1.18.2-40.2.1-universal.jar%2368!/:?] {re:classloading}
at net.minecraftforge.client.loading.ClientModLoader.completeModLoading(ClientModLoader.java:170) ~[forge-1.18.2-40.2.1-universal.jar%2368!/:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$new$1(Minecraft.java:557) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.Util.m_137521_(Util.java:397) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:classloading}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:551) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.screens.LoadingOverlay.m_6305_(LoadingOverlay.java:135) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:879) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1046) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:665) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:205) ~[client-1.18.2-20220404.173914-srg.jar%2363!/:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:31) ~[fmlloader-1.18.2-40.2.1.jar%2317!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.3.jar%235!/:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

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

-- Head --
Thread: Render thread
Stacktrace:
at net.sweenus.simplyswords.SimplySwords.init(SimplySwords.java:44) ~[simplyswords-forge-1.40-1.18.2.jar%2362!/:?] {re:classloading}
-- MOD simplyswords --
Details:
Caused by 0: java.lang.reflect.InvocationTargetException
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:67) ~[javafmllanguage-1.18.2-40.2.1.jar%2365!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:106) ~[fmlcore-1.18.2-40.2.1.jar%2364!/:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}

Mod File: /Applications/ATLauncher.app/Contents/Java/instances/simplyswordtest/mods/simplyswords-forge-1.40-1.18.2.jar
Failure message: Simply Swords (simplyswords) has failed to load correctly
	java.lang.reflect.InvocationTargetException: null
Mod Version: 1.40-1.18.2
Mod Issue URL: https://github.com/Sweenus/SimplySwords/issues
Exception message: java.lang.NullPointerException: Cannot invoke "com.google.gson.JsonObject.has(String)" because "json" is null

Stacktrace:
at net.sweenus.simplyswords.SimplySwords.init(SimplySwords.java:44) ~[simplyswords-forge-1.40-1.18.2.jar%2362!/:?] {re:classloading}
at net.sweenus.simplyswords.forge.SimplySwordsForge.(SimplySwordsForge.java:18) ~[simplyswords-forge-1.40-1.18.2.jar%2362!/:?] {re:classloading}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:67) ~[javafmllanguage-1.18.2-40.2.1.jar%2365!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:106) ~[fmlcore-1.18.2-40.2.1.jar%2364!/:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}

-- System Details --
Details:
Minecraft Version: 1.18.2
Minecraft Version ID: 1.18.2
Operating System: Mac OS X (x86_64) version 10.15.7
Java Version: 17.0.1, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 1154975584 bytes (1101 MiB) / 3355443200 bytes (3200 MiB) up to 10737418240 bytes (10240 MiB)
CPUs: 12
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Identifier: Intel64 Family 6 Model 158 Stepping 10
Microarchitecture: Coffee Lake
Frequency (GHz): 2.60
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 12
Graphics card #0 name: Intel UHD Graphics 630
Graphics card #0 vendor: Intel
Graphics card #0 VRAM (MB): 1536.00
Graphics card #0 deviceId: 0x3e9b
Graphics card #0 versionInfo: Revision ID: 0x0000, gMux Version: 5.0.0
Graphics card #1 name: Radeon Pro 555X
Graphics card #1 vendor: AMD (0x1002)
Graphics card #1 VRAM (MB): 4096.00
Graphics card #1 deviceId: 0x67ef
Graphics card #1 versionInfo: Revision ID: 0x00e3, ROM Revision: 113-C980AL-075, VBIOS Version: 113-C97501P-005, EFI Driver Version: 01.A1.075, gMux Version: 5.0.0
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 2.40
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 2.40
Memory slot #1 type: DDR4
Virtual memory max (MB): 17408.00
Virtual memory used (MB): 10352.34
Swap memory total (MB): 1024.00
Swap memory used (MB): 314.25
JVM Flags: 11 total; -XX:-OmitStackTraceInFastThrow -Xms512M -Xmx10240M -XX:MetaspaceSize=256M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -Xss1M
ModLauncher: 9.1.3+9.1.3+main.9b69c82a
ModLauncher launch target: forgeclient
ModLauncher naming: srg
ModLauncher services:
mixin PLUGINSERVICE
eventbus PLUGINSERVICE
slf4jfixer PLUGINSERVICE
object_holder_definalize PLUGINSERVICE
runtime_enum_extender PLUGINSERVICE
capability_token_subclass PLUGINSERVICE
accesstransformer PLUGINSERVICE
runtimedistcleaner PLUGINSERVICE
mixin TRANSFORMATIONSERVICE
fml TRANSFORMATIONSERVICE
FML Language Providers:
[email protected]
lowcodefml@null
javafml@null
Mod List:
client-1.18.2-20220404.173914-srg.jar |Minecraft |minecraft |1.18.2 |COMMON_SET|Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
forge-1.18.2-40.2.1-universal.jar |Forge |forge |40.2.1 |COMMON_SET|Manifest: 84:ce:76:e8:45:35:e4:0e:63:86:df:47:59:80:0f:67:6c:c1:5f:6e:5f:4d:b3:54:47:1a:9f:7f:ed:5e:f2:90
architectury-4.11.89-forge.jar |Architectury |architectury |4.11.89 |COMMON_SET|Manifest: NOSIGNATURE
simplyswords-forge-1.40-1.18.2.jar |Simply Swords |simplyswords |1.40-1.18.2 |ERROR |Manifest: NOSIGNATURE
Crash Report UUID: 4f26e91e-13f5-4957-bd6c-02c3b3636f82
FML: 40.2
Forge: net.minecraftforge:40.2.1

So, after test with only the mod with it dependency i get the exact same error.

Are you able to try importing your modpack into the CurseForge launcher and testing it there?

I believe @Quakyytheduck mentioned on Discord that it was an issue with ATLauncher specifically, and that it worked fine in the CurseForge launcher.

No worries - thank you for getting back to me!

It's quite a strange issue, something prevents the json config files from loading in that very specific scenario.
I hope to replace my current config system with Cloth Config in the not too distant future - I think this will resolve the issue.

Indeed the ATLauncher was the problem all along, with the curselauncher the problem doesnt occur. Thank you for your troubleshooting.