Basically, I have been getting the same error no matter what I do. I included pictures demonstrating my process, and besides the pictues, I don'tthink there's anything else except the error report.
Executing gradle task: build
Build info: MCreator 2020.1.05419, 1.14.4, 64-bit, 3968 MB, Windows 10, JVM 1.8.0_232, JAVA_HOME: C:\Users\TONY\Desktop\MCreator\jdk
> Configure project :
New Dep: net.minecraftforge:forge:1.14.4-28.1.117_mapped_snapshot_20190719-1.14.3
> Task :compileJava
C:\Users\TONY\MCreatorWorkspaces\tonys_bunch_o_crap_mod\src\main\java\net\mcreator\tonys_bunch_o_crap_mod\MCreatorSampleGUI.java:144: error: Override is not a repeatable annotation type
> Task :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.
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.
BUILD FAILED in 20s
1 actionable task: 1 executed