Проблема с версией Gradle

да после gradlew setupDecompWorkspace эта ошибка пропадает
я это делал в первый раз и пытался перепробовать все варианты, сейчас запустил данную конфигурацию и всё заработало но остался последний вопрос. так и должно быть?
Посмотреть вложение 13875
но запустить клиент чер idea не удаётся
Java:
14:52:28: Executing task 'runClient'...

> Task :compileApiJava NO-SOURCE
> Task :processApiResources NO-SOURCE
> Task :apiClasses UP-TO-DATE
> Task :sourceMainJava UP-TO-DATE

> Task :compileJava FAILED
warning: [options] bootstrap class path not set in conjunction with -source 1.6
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\CreateLaunch4jXMLTask.java:3: error: package org.gradle.api does not exist
import org.gradle.api.DefaultTask;
                     ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\CreateLaunch4jXMLTask.java:4: error: package org.gradle.api.tasks does not exist
import org.gradle.api.tasks.OutputFile;
                           ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\CreateLaunch4jXMLTask.java:5: error: package org.gradle.api.tasks does not exist
import org.gradle.api.tasks.TaskAction;
                           ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\CreateLaunch4jXMLTask.java:21: error: cannot find symbol
public class CreateLaunch4jXMLTask extends DefaultTask {
                                           ^
  symbol: class DefaultTask
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:3: error: package groovy.lang does not exist
import groovy.lang.Closure;
                  ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:4: error: package org.gradle.api does not exist
import org.gradle.api.*;
^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:5: error: package org.gradle.api.file does not exist
import org.gradle.api.file.CopySpec;
                          ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:6: error: package org.gradle.api.plugins does not exist
import org.gradle.api.plugins.JavaPlugin;
                             ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:7: error: package org.gradle.api.tasks does not exist
import org.gradle.api.tasks.Exec;
                           ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:8: error: package org.gradle.api.tasks does not exist
import org.gradle.api.tasks.Sync;
                           ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:9: error: package org.gradle.api.tasks.bundling does not exist
import org.gradle.api.tasks.bundling.Jar;
                                    ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:14: error: cannot find symbol
public class Launch4jPlugin implements Plugin<Project> {
                                       ^
  symbol: class Plugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:14: error: cannot find symbol
public class Launch4jPlugin implements Plugin<Project> {
                                              ^
  symbol: class Project
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:25: error: cannot find symbol
    Project project;
    ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:27: error: cannot find symbol
    public void apply(Project project) {
                      ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:53: error: cannot find symbol
    private Task addCreateLaunch4jXMLTask(Project project, Launch4jPluginExtension configuration) {
                                          ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPluginExtension.java:3: error: package org.gradle.api does not exist
import org.gradle.api.Project;
                     ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPluginExtension.java:4: error: package org.gradle.api.plugins does not exist
import org.gradle.api.plugins.JavaPluginConvention;
                             ^
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:53: error: cannot find symbol
    private Task addCreateLaunch4jXMLTask(Project project, Launch4jPluginExtension configuration) {
            ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:64: error: cannot find symbol
    private Task addCopyToLibTask(Project project, Launch4jPluginExtension configuration) {
                                  ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:64: error: cannot find symbol
    private Task addCopyToLibTask(Project project, Launch4jPluginExtension configuration) {
            ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:80: error: cannot find symbol
    private Task addRunLauch4jTask(Project project, Launch4jPluginExtension configuration) {
                                   ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:80: error: cannot find symbol
    private Task addRunLauch4jTask(Project project, Launch4jPluginExtension configuration) {
            ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:97: error: cannot find symbol
    private Task addLaunch4jTask(Project project, Launch4jPluginExtension configuration) {
                                 ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:97: error: cannot find symbol
    private Task addLaunch4jTask(Project project, Launch4jPluginExtension configuration) {
            ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:105: error: cannot find symbol
    private CopySpec configureDistSpec(Project project) {
                                       ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:105: error: cannot find symbol
    private CopySpec configureDistSpec(Project project) {
            ^
  symbol:   class CopySpec
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:115: error: cannot find symbol
    public DefaultTask makeTask(String name) {
           ^
  symbol:   class DefaultTask
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:119: error: cannot find symbol
    public <T extends Task> T makeTask(String name, Class<T> type) {
                      ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:124: error: cannot find symbol
    public static <T extends Task> T makeTask(Project proj, String name, Class<T> type) {
                             ^
  symbol:   class Task
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPlugin.java:124: error: cannot find symbol
    public static <T extends Task> T makeTask(Project proj, String name, Class<T> type) {
                                              ^
  symbol:   class Project
  location: class Launch4jPlugin
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPluginExtension.java:55: error: cannot find symbol
    public File getXmlOutFileForProject(Project project) {
                                        ^
  symbol:   class Project
  location: class Launch4jPluginExtension
C:\mcmod\build\sources\java\edu\sc\seis\launch4j\Launch4jPluginExtension.java:59: error: cannot find symbol
    void initExtensionDefaults(Project project) {
                               ^
  symbol:   class Project
  location: class Launch4jPluginExtension
C:\mcmod\build\sources\java\net\minecraftforge\gradle\common\BaseExtension.java:5: error: package org.gradle.api does not exist
import org.gradle.api.Project;
 
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