I have been playing the Mineshafts and Monsters mod-pack via the curse forge app, and upon updating to the latest version of the mod-pack the game has started crashing while mod-loading.
All of the settings are the default apart from the ram which I have increased to 9gb which my computer is generally perfectly able to handle. The crash almost always occurs around the same time in mod loading with the exit code 1 and statement about invalid java runtime configuration, which I have not altered to my knowledge.

Any assistance or advice would be greatly appreciated.

(apologies if anything is incorrect format wise this is my first time posting on these forums)

Here is the output log:

10:25:06.272

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98)

10:25:06.272

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

10:25:06.272

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at net.optifine.reflect.Reflector.<clinit>(Reflector.java:307)

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at net.minecraft.crash.CrashReport.func_71504_g(CrashReport.java:101)

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at net.minecraft.crash.CrashReport.<init>(CrashReport.java:54)

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at net.minecraft.crash.CrashReport.func_230188_h_(CrashReport.java:425)

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:643]: at net.minecraft.client.main.Main.main(Main.java:122)

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:643]: ... 11 more

10:25:06.273

STDERR

main

[java.lang.Throwable:printStackTrace:667]: Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Redirector redirectGetFancyWeather()Z in magnesium.mixins.json:features.options.MixinWorldRenderer failed injection check, (0/1) succeeded. Scanned 1 target(s). Using refmap magnesium.refmap.json

10:25:06.280

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.postInject(InjectionInfo.java:468)

10:25:06.280

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1362)

10:25:06.281

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1051)

10:25:06.281

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:400)

10:25:06.281

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:325)

10:25:06.281

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:383)

10:25:06.281

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:365)

10:25:06.289

STDERR

main

[java.lang.Throwable:printStackTrace:667]: at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)

10:25:06.289

STDERR

main

[java.lang.Throwable:printStackTrace:667]: ... 26 more

10:25:07.017

launcher

main

10:25:07.017

monitor

Process Monitor

Process crashed with exit code 1

Problem with Magnesium. Make sure you are using the latest version of the Mod. If you already use the latest version, report this bug to the Mod author.

For anyone having the same problem:

Roadrunner is another mod like this, that caused the same problem for me and my friends