help geckolib

It's the problem I'm facing. I don't know what's going on but help me I've been working all day to fix this.
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> Task :compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Could not resolve all files for configuration ':compileClasspath'.
> Could not find software.bernie.geckolib:forge-1.15.2-geckolib:2.0.0_mapped_snapshot_20200514-1.15.1.
Searched in the following locations:
- https://repo.repsy.io/mvn/gandiber/geckolib/software/bernie/geckolib/fo…
- https://repo.repsy.io/mvn/gandiber/geckolib/software/bernie/geckolib/fo…
- https://maven.minecraftforge.net/software/bernie/geckolib/forge-1.15.2-…
- https://maven.minecraftforge.net/software/bernie/geckolib/forge-1.15.2-…
- file:/C:/Users/USER-WIN10/.mcreator/gradle/caches/forge_gradle/bundeled_repo/software/bernie/geckolib/forge-1.15.2-geckolib/2.0.0_mapped_snapshot_20200514-1.15.1/forge-1.15.2-geckolib-2.0.0_mapped_snapshot_20200514-1.15.1.pom
- file:/C:/Users/USER-WIN10/.mcreator/gradle/caches/forge_gradle/bundeled_repo/software/bernie/geckolib/forge-1.15.2-geckolib/2.0.0_mapped_snapshot_20200514-1.15.1/forge-1.15.2-geckolib-2.0.0_mapped_snapshot_20200514-1.15.1.jar
- https://libraries.minecraft.net/software/bernie/geckolib/forge-1.15.2-g…
- https://repo.maven.apache.org/maven2/software/bernie/geckolib/forge-1.1…
- https://repo.maven.apache.org/maven2/software/bernie/geckolib/forge-1.1…
Required by:
project :
* 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 14s
1 actionable task: 1 executed
BUILD FAILED