setup forge error - Githubissues

trying to setup forge I got this error :

F:\Valerium\forge>gradlew setupForge
To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: https://docs.gradle.org/3.0/userguide/gradle_daemon.html.
Daemon will be stopped at the end of the build stopping after processing

FAILURE: Build failed with an exception.

* Where:
Build file 'F:\Valerium\forge\build.gradle' line: 42

* What went wrong:
Could not compile build file 'F:\Valerium\forge\build.gradle'.
> startup failed:
  build file 'F:\Valerium\forge\build.gradle': 42: unable to resolve class net.minecraftforge.gradle.dev.ForgeDevPlugin
 @ line 42, column 1.
     import static net.minecraftforge.gradle.dev.ForgeDevPlugin.*
     ^

  build file 'F:\Valerium\forge\build.gradle': 42: unable to resolve class net.minecraftforge.gradle.dev.ForgeDevPlugin
 @ line 42, column 1.
     import static net.minecraftforge.gradle.dev.ForgeDevPlugin.*
     ^

  2 errors

* 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: 15.37 secs

F:\Valerium\forge>

build.gradle:

buildscript {
    repositories {
        mavenCentral()
        maven {
            name = "forge"
            url = "https://maven.minecraftforge.net"
        }
        maven {
            name = "sonatype"
            url = "https://oss.sonatype.org/content/repositories/snapshots/"
        }
        maven {
            name = "maven-mirror"
            url = "https://repo.maven.apache.org/maven2"
        }
    }
    dependencies {
        classpath ('com.anatawa12.forge:ForgeGradle:1.2-1.0.+') {

    changing = true
        }
    }
}

// fixes building errors due to switch to HTTPS
allprojects {
    repositories {
        all { ArtifactRepository repo ->
            if (repo instanceof MavenArtifactRepository){
                if (repo.url.toString().startsWith("http://repo1.maven.org/maven2")) {
                    repo.url = repo.url.toString().replace("http://", "https://")
                }
            }
        }
    }
}

configurations {
    deployJars
}

import static net.minecraftforge.gradle.dev.ForgeDevPlugin.*

apply plugin: 'maven'
apply plugin: 'forgedev'

repositories {
    mavenLocal()
    flatDir {
        name "fileRepo"
        dirs "repo"
    }
}

minecraft {
    version = '1.7.10'
    mcpVersion = '9.05'
    fmlDir = projectDir.getAbsolutePath() + "/fml";
    mainClass = 'cpw.mods.fml.relauncher.ServerLaunchWrapper'
    tweakClass = 'cpw.mods.fml.common.launcher.FMLTweaker'
    installerVersion = "1.4"
}

group = 'net.minecraftforge'
version = getVersionFromJava(getProject(), 'src/main/java/net/minecraftforge/common/ForgeVersion.java')

jenkins {
    job = 'minecraftforge'
}

launch4j {
    jreMinVersion = '1.6.0'
}

// fixes building jar, although errors are present when building
createChangelog.enabled = false

Doenerstyle / MinecraftForge-1.7.10

setup forge error #2