My client won't run

I am getting an error when trying to launch Minecraft to test aspects of my mod. what do I do? here is error message

   
Executing gradle command: runClient
Build info: MCreator 1.9.0, 64-bit, 8192 MB, Mac OS X - bash, JVM 1.8.0_212, JAVA_HOME: /Applications/MCreator.app/Contents/MacOS/jdk/Contents/Home/jre
This mapping 'snapshot_20171003' was designed for MC 1.12! Use at your own peril.
:deobfCompileDummyTask
:deobfProvidedDummyTask
:sourceApiJava UP-TO-DATE
:compileApiJava NO-SOURCE
:processApiResources NO-SOURCE
:apiClasses UP-TO-DATE
:sourceMainJava UP-TO-DATE
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:jar UP-TO-DATE
:getVersionJson
:extractNatives SKIPPED
:extractUserdev UP-TO-DATE
:getAssetIndex UP-TO-DATE
:getAssets
Current status: 1304/1305   99%
:makeStart SKIPPED
:runClient
21:34.43 [main/INFO] [GradleStart]: Extra: []
21:34.43 [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --assetsDir, /Users/queenpippin/.mcreator/gradle/caches/minecraft/assets, --assetIndex, 1.12, --accessToken{REDACTED}, --version, 1.12.2, --tweakClass, net.minecraftforge.fml.common.launcher.FMLTweaker, --tweakClass, net.minecraftforge.gradle.tweakers.CoremodTweaker]
21:34.43 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
21:34.43 [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
21:34.43 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.CoremodTweaker
21:34.43 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
21:34.43 [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2768 for Minecraft 1.12.2 loading
21:34.43 [main/INFO] [FML]: Java is LibericaJDK 64-Bit Server VM, version 1.8.0_212, running on Mac OS X:x86_64:10.14.6, installed at /Applications/MCreator.app/Contents/MacOS/jdk/Contents/Home/jre
21:34.43 [main/ERROR] [FML]: Apache Maven library folder was not in the format expected. Using default libraries directory.
21:34.43 [main/ERROR] [FML]: Full: /Users/queenpippin/.mcreator/gradle/caches/modules-2/files-2.1/org.apache.maven/maven-artifact/3.5.3/7dc72b6d6d8a6dced3d294ed54c2cc3515ade9f4/maven-artifact-3.5.3.jar
21:34.43 [main/ERROR] [FML]: Trimmed: /users/queenpippin/.mcreator/gradle/caches/modules-2/files-2.1/org.apache.maven/maven-artifact/3.5.3/
21:34.43 [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
21:34.43 [main/INFO] [FML]: Detected deobfuscated environment, loading log configs for colored console logs.
2019-08-24 21:34:44,008 main WARN Disabling terminal, you're running in an unsupported environment.
21:34.44 [main/INFO] [FML]: Ignoring missing certificate for coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin), we are in deobf and it's a forge core plugin
21:34.44 [main/INFO] [FML]: Ignoring missing certificate for coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin), we are in deobf and it's a forge core plugin
21:34.44 [main/INFO] [FML]: Searching /Users/queenpippin/MCreatorWorkspaces/mineclash/run/./mods for mods
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
21:34.44 [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
21:34.44 [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
21:34.44 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
21:34.44 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
21:34.44 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
21:34.44 [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
21:34.44 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
21:34.45 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
21:34.45 [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
21:34.45 [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
21:34.45 [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
:runClient FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':runClient'.
> Process 'command '/Applications/MCreator.app/Contents/MacOS/jdk/Contents/Home/bin/java'' finished with non-zero exit value 134
* 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
BUILD FAILED in 6s
12 actionable tasks: 5 executed, 7 up-to-date
Task completed with return code 1 in 6317 milliseconds