Hello there mod creator! Im having an issue on start up and when i checked the "crash-fml.txt" file is came with this error. Now idk what this does or how it does it. But i'm having an issue. Hopefully this can be resolved in a short timeframe, but i know how long it takes to update mods so take your time with it. Now, idk what is useful and what can be tossed so i just included everything.
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:68) ~[javafmllanguage-1.20.1-47.2.0.jar%23374!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:123) ~[fmlcore-1.20.1-47.2.0.jar%23373!/:?] {re:mixin}
at java.util.concurrent.CompletableFuture$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}
Stacktrace:
at com.electronwill.nightconfig.core.io.ParsingException.notEnoughData(ParsingException.java:22) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.io.ReaderInput.directReadChar(ReaderInput.java:36) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.io.AbstractInput.readChar(AbstractInput.java:49) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.io.AbstractInput.readCharsUntil(AbstractInput.java:123) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.toml.TableParser.parseKey(TableParser.java:166) ~[toml-3.6.4.jar%2394!/:?] {}
at com.electronwill.nightconfig.toml.TableParser.parseDottedKey(TableParser.java:145) ~[toml-3.6.4.jar%2394!/:?] {}
at com.electronwill.nightconfig.toml.TableParser.parseNormal(TableParser.java:55) ~[toml-3.6.4.jar%2394!/:?] {}
at com.electronwill.nightconfig.toml.TomlParser.parse(TomlParser.java:44) ~[toml-3.6.4.jar%2394!/:?] {}
at com.electronwill.nightconfig.toml.TomlParser.parse(TomlParser.java:37) ~[toml-3.6.4.jar%2394!/:?] {}
at com.electronwill.nightconfig.core.io.ConfigParser.parse(ConfigParser.java:113) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.io.ConfigParser.parse(ConfigParser.java:219) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.io.ConfigParser.parse(ConfigParser.java:202) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.file.WriteSyncFileConfig.load(WriteSyncFileConfig.java:73) ~[core-3.6.4.jar%2393!/:?] {}
at com.electronwill.nightconfig.core.file.AutosaveCommentedFileConfig.load(AutosaveCommentedFileConfig.java:85) ~[core-3.6.4.jar%2393!/:?] {}
at tallestegg.guardvillagers.configuration.GuardConfig.loadConfig(GuardConfig.java:63) ~[guardvillagers-1.20.1-1.6.3.jar%23313!/:1.20.1-1.6.3] {re:classloading,re:mixin}
at tallestegg.guardvillagers.GuardVillagers.(GuardVillagers.java:28) ~[guardvillagers-1.20.1-1.6.3.jar%23313!/:1.20.1-1.6.3] {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:68) ~[javafmllanguage-1.20.1-47.2.0.jar%23374!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$10(ModContainer.java:123) ~[fmlcore-1.20.1-47.2.0.jar%23373!/:?] {re:mixin}
at java.util.concurrent.CompletableFuture$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}

Can I see your config for guard villagers?

Where would be at? Because in the config files under the tag of guard villagers are toml files. If thats what you're asking.

Those are the files I'm asking for because it seems like something went wrong with how you set up your configs, please copy and paste what you have in there to here.

They both say "NUL NUL NUL NUL NUL NUL NUL NUL" ad infinitum in notepad++ and in VS Code it has tons of these -> � also with nulls at the end.

Delete your .toml files and restart the game.

It fixed the issue of there being no nuls anymore and instead gave exit code 1

Please send the new crash report from the crash reports folder and your debug.log in a pastebin file

It seems like it fixed itself? After a few restarts and a few more crashes later (Ranging from exit code -1073741819 to 1 and mod a few errors). Granted, this could be caused by something else, a mod updating perhaps? But it's now working fine. If you still want that crash report and debug log i'll send it over. All i gotta ask is where is the debug.log at?

debug.log is in the logs folder in the minecraft directory

I believe i did it correctly, idk though i'm new here. And thanks for your assistance.
https://pastebin.com/Lsntftee
https://pastebin.com/NmXUYRkS