I have the same error code.
Here's what I got. Unsure if this is the correct debug log in question.
I realize that I am not using the recommended version of Forge, but I was going down the list of installers to see if it would work.
18:57:30.899
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
18:57:30.899
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
18:57:30.899
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
18:57:30.899
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
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at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
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at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.JarModuleFinder.<init>(JarModuleFinder.java:29)
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at cpw.mods.securejarhandler@1.0.3/cpw.mods.cl.JarModuleFinder.of(JarModuleFinder.java:43)
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at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.ModuleLayerHandler.buildLayer(ModuleLayerHandler.java:70)
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at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.TransformationServicesHandler.buildTransformingClassLoader(TransformationServicesHandler.java:60)
18:57:30.899
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.Launcher.run(Launcher.java:104)
18:57:30.899
at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
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at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
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at MC-BOOTSTRAP/cpw.mods.modlauncher@9.1.3/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
18:57:30.899
at cpw.mods.bootstraplauncher@1.0.0/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149)
18:57:31.379
Process crashed with exit code 1