Gradle task failed

I have tried to install mcreator several tomes but it always says gradle task failed

i have

windows 7 64 bit

3 gb ram

2 gb graphics card

 and a dual core processor

and have a mobile 4g internet connection

bug report 

MCreator was not able to connect to the internet. Gradle tasks might not work.
   
Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
D:\mcreat>cd forge
D:\mcreat\forge>SET "JAVA_HOME=D:\mcreat\jdk64\"
D:\mcreat\forge>SET JAVA_EXE=%JAVA_HOME%\bin\java.exe
D:\mcreat\forge>SET PATH=%JAVA_HOME%\bin\;%PATH%
D:\mcreat\forge>gradlew -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" cleanCache clean setupDecompWorkspace --refresh-dependencies 
FAILURE: Build failed with an exception.
* What went wrong:
BUILD FAILED
A problem occurred configuring root project 'forge'.
> Could not resolve all dependencies for configuration ':classpath'.
Total time: 10.522 secs
> Could not resolve net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT.
     Required by:
         :forge:unspecified
> Could not resolve net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT.
> Unable to load Maven meta-data from https://jcenter.bintray.com/net/minecraftforge/gradle/ForgeGradle/2.3-S….
> Could not GET 'https://jcenter.bintray.com/net/minecraftforge/gradle/ForgeGradle/2.3-S…'.
> jcenter.bintray.com
> Could not resolve net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT.
> Unable to load Maven meta-data from http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGr….
> Could not GET 'http://files.minecraftforge.net/maven/net/minecraftforge/gradle/ForgeGr…'.
> files.minecraftforge.net
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
D:\mcreat\forge>
Task completed with return code 0 in 12749 milliseconds
   
Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
D:\mcreat>cd forge
D:\mcreat\forge>SET "JAVA_HOME=D:\mcreat\jdk64\"
D:\mcreat\forge>SET JAVA_EXE=%JAVA_HOME%\bin\java.exe
D:\mcreat\forge>SET PATH=%JAVA_HOME%\bin\;%PATH%
D:\mcreat\forge>gradlew -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" cleanCache clean setupDecompWorkspace --refresh-dependencies 
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
   at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
   at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1959)
   at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
   at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
   at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1514)
   at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
   at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026)
   at sun.security.ssl.Handshaker.process_record(Handshaker.java:961)
   at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1072)
   at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
   at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
   at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
   at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
   at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractD…
   at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImp…
   at net.minecraftforge.gradle.common.BasePlugin.getWithEtag(BasePlugin.java:724)
   at net.minecraftforge.gradle.common.BasePlugin.getWithEtag(BasePlugin.java:685)
   at net.minecraftforge.gradle.common.BasePlugin.getRemoteJsons(BasePlugin.java:233)
   at net.minecraftforge.gradle.common.BasePlugin.apply(BasePlugin.java:183)
   at net.minecraftforge.gradle.common.BasePlugin.apply(BasePlugin.java:92)
   at org.gradle.api.internal.plugins.ImperativeOnlyPluginApplicator.applyImperative(ImperativeOnlyPluginApplicator.java:35)
   at org.gradle.api.internal.plugins.RuleBasedPluginApplicator.applyImperative(RuleBasedPluginApplicator.java:43)
   at org.gradle.api.internal.plugins.DefaultPluginManager.doApply(DefaultPluginManager.java:137)
   at org.gradle.api.internal.plugins.DefaultPluginManager.apply(DefaultPluginManager.java:112)
   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.applyType(DefaultObjectConfigurationAction.java:113)
   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.access$200(DefaultObjectConfigurationAction.java:36)
   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction$3.run(DefaultObjectConfigurationAction.java:80)
   at org.gradle.api.internal.plugins.DefaultObjectConfigurationAction.execute(DefaultObjectConfigurationAction.java:136)
   at org.gradle.api.internal.project.AbstractPluginAware.apply(AbstractPluginAware.java:46)
   at org.gradle.api.internal.project.ProjectScript.apply(ProjectScript.java:34)
   at org.gradle.api.Script$apply$0.callCurrent(Unknown Source)
   at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
   at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
   at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:166)
   at build_crwvcia6g5cay2o3n09zvxl9c.run(D:\mcreat\forge\build.gradle:10)
   at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91)
   at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl$2.run(DefaultScriptPluginFactory.java:177)
   at org.gradle.configuration.ProjectScriptTarget.addConfiguration(ProjectScriptTarget.java:77)
   at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:182)
   at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:38)
   at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:25)
   at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
   at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:55)
   at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:540)
   at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:93)
   at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:42)
   at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)
   at org.gradle.initialization.DefaultGradleLauncher$2.run(DefaultGradleLauncher.java:124)
   at org.gradle.internal.Factories$1.create(Factories.java:22)
   at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
   at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)
   at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:121)
   at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
   at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)
   at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)
   at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
   at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)
   at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:92)
   at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:83)
   at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:99)
   at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
   at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
   at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:48)
   at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
   at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)
   at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)
   at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:52)
   at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
   at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
   at org.gradle.util.Swapper.swap(Swapper.java:38)
   at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:40)
BUILD FAILED
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecuti   at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:60)
on.java:120)
Total time: 1 mins 0.555 secs
   at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:72)
   at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41)
   at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
   at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
   at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:237)
   at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
   at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   at java.lang.Thread.run(Thread.java:745)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
   at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:397)
   at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:302)
   at sun.security.validator.Validator.validate(Validator.java:260)
   at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
   at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
   at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
   at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1496)
   ... 92 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
   at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
   at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
   at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
   at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:392)
   ... 98 more
FAILURE: Build failed with an exception.
* Where:
Build file 'D:\mcreat\forge\build.gradle' line: 10
* What went wrong:
A problem occurred evaluating root project 'forge'.
> Failed to apply plugin [id 'net.minecraftforge.gradle.forge']
> Unable to obtain url ([https://launchermeta.mojang.com/mc/game/version_manifest.json]) with etag!
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
D:\mcreat\forge>
Task completed with return code 0 in 61825 milliseconds
   
Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
D:\mcreat>cd forge
D:\mcreat\forge>SET "JAVA_HOME=D:\mcreat\jdk64\"
D:\mcreat\forge>SET JAVA_EXE=%JAVA_HOME%\bin\java.exe
D:\mcreat\forge>SET PATH=%JAVA_HOME%\bin\;%PATH%
D:\mcreat\forge>gradlew -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" cleanCache clean setupDecompWorkspace --refresh-dependencies 
FAILURE: Build failed with an exception.
* What went wrong:
BUILD FAILED
Total time: 1 mins 51.902 secs
A problem occurred configuring root project 'forge'.
> Could not resolve all dependencies for configuration ':classpath'.
> Could not resolve com.github.abrarsyed.jastyle:jAstyle:1.3.
     Required by:
:forge:unspecified 
      > net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT
> Could not resolve com.github.abrarsyed.jastyle:jAstyle:1.3.
> Could not get resource 'https://jcenter.bintray.com/com/github/abrarsyed/jastyle/jAstyle/1.3/jA…'.
> Could not HEAD 'https://jcenter.bintray.com/com/github/abrarsyed/jastyle/jAstyle/1.3/jA…'.
> Connect to repo.jfrog.org:443 [repo.jfrog.org/34.204.33.255, repo.jfrog.org/52.72.224.151] failed: Connection timed out: connect
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
D:\mcreat\forge>
Task completed with return code 0 in 113660 milliseconds