Error when running gradlew setupDevWorkspace eclipse

[fofo]

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'forge-1.8.9-11.15.1.2318-1.8.9-mdk'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Could not resolve net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT.
     Required by:
         :forge-1.8.9-11.15.1.2318-1.8.9-mdk:unspecified
      > Could not resolve net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT.
         > Unable to load Maven meta-data from https://jcenter.bintray.com/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml.
            > Could not GET 'https://jcenter.bintray.com/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml'.
               > peer not authenticated
      > Could not resolve net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT.
         > Unable to load Maven meta-data from http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml.
            > Could not GET 'http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGradle/2.1-SNAPSHOT/maven-metadata.xml'.
               > peer not authenticated

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 2.78 secs

This is the error I got. Any help would be appreciated!

[fofo]

Bump!