For some reason, I cannot run .\gradlew setupDecompWorkspace and it always fails to build. I don't know the error, obviously. It has the build.gradle file in the folder, and everything I've read online says that it should work.
Here's the 'what went wrong' section of the powershell report
FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring root project 'mod2'.
> Could not resolve all files for configuration ':_compileJava_1'.
> Could not resolve java3d:vecmath:1.5.2.
Required by:
project :
> Could not resolve java3d:vecmath:1.5.2.
> Could not get resource 'https://libraries.minecraft.net/java3d/vecmath/1.5.2/vecmath-1.5.2.jar'.
> Could not HEAD 'https://libraries.minecraft.net/java3d/vecmath/1.5.2/vecmath-1.5.2.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:patchy:1.1.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:patchy:1.1.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/patchy/1.1/patchy-1.1.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/patchy/1.1/patchy-1.1.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve oshi-project:oshi-core:1.1.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve oshi-project:oshi-core:1.1.
> Could not get resource 'https://libraries.minecraft.net/oshi-project/oshi-core/1.1/oshi-core-1.1.jar'.
> Could not HEAD 'https://libraries.minecraft.net/oshi-project/oshi-core/1.1/oshi-core-1.1.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.ibm.icu:icu4j-core-mojang:51.2.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.ibm.icu:icu4j-core-mojang:51.2.
> Could not get resource 'https://libraries.minecraft.net/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:javabridge:1.0.22.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:javabridge:1.0.22.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/javabridge/1.0.22/javabridge-1.0.22.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/javabridge/1.0.22/javabridge-1.0.22.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:brigadier:1.0.17.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:brigadier:1.0.17.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/brigadier/1.0.17/brigadier-1.0.17.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/brigadier/1.0.17/brigadier-1.0.17.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:datafixerupper:2.0.24.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:datafixerupper:2.0.24.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/datafixerupper/2.0.24/datafixerupper-2.0.24.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/datafixerupper/2.0.24/datafixerupper-2.0.24.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:authlib:1.5.25.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:authlib:1.5.25.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/authlib/1.5.25/authlib-1.5.25.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/authlib/1.5.25/authlib-1.5.25.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
> Could not resolve com.mojang:text2speech:1.11.3.
Required by:
project : > net.minecraft:client:1.14.4
> Could not resolve com.mojang:text2speech:1.11.3.
> Could not get resource 'https://libraries.minecraft.net/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar'.
> Could not HEAD 'https://libraries.minecraft.net/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar'.
> sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.9/userguide/command_line_interface.html#sec:command_line_warnings
BUILD FAILED in 1m 11s