Bug with the GUIs

All the GUIs that I have give problems in the console and in the build this is the error:

Executing gradle task: build
Build info: MCreator 2020.1.05419, 1.12.2, 64-bit, 16335 MB, Windows 10, JVM 1.8.0_232, JAVA_HOME: C:\Program Files\Pylo\MCreator\jdk
This mapping 'snapshot_20171003' was designed for MC 1.12! Use at your own peril.
:deobfCompileDummyTask
:getVersionJson
:extractUserdev UP-TO-DATE
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:applyBinaryPatches SKIPPED
:deobfProvidedDummyTask
:extractDependencyATs SKIPPED
:extractMcpData SKIPPED
:extractMcpMappings SKIPPED
:genSrgs SKIPPED
:deobfMcMCP SKIPPED
:sourceApiJava UP-TO-DATE
:compileApiJava NO-SOURCE
:processApiResources NO-SOURCE
:apiClasses UP-TO-DATE
:sourceMainJava UP-TO-DATE
C:\Users\NitroPC\MCreatorWorkspaces\chemical_elements\build\sources\main\java\net\mcreator\chemical_elements\MCreatorAHGUI.java:121: error: Override is not a repeatable annotation type
      @Override
      ^
C:\Users\NitroPC\MCreatorWorkspaces\chemical_elements\build\sources\main\java\net\mcreator\chemical_elements\MCreatorAtomSGUI.java:155: error: Override is not a repeatable annotation type
      @Override
      ^
C:\Users\NitroPC\MCreatorWorkspaces\chemical_elements\build\sources\main\java\net\mcreator\chemical_elements\MCreatorOxidatorGUI.java:125: error: Override is not a repeatable annotation type
      @Override
      ^
C:\Users\NitroPC\MCreatorWorkspaces\chemical_elements\build\sources\main\java\net\mcreator\chemical_elements\MCreatorSOMTgui.java:135: error: Override is not a repeatable annotation type
      @Override
      ^
4 errors
:compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.
* 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 17s
7 actionable tasks: 4 executed, 3 up-to-date
BUILD FAILED
Task completed in 19194 milliseconds