Сконфигурированный compileSdkVersion недействителен

Здравствуйте, у меня проблема со сборкой или созданием apk-файла в этом проекте gluon. Я следую шагу создания проекта на этом сайте http://docs.gluonhq.com/charm/3.0.0/#_android_2. Я полный новичок в этом фреймворке. Пожалуйста помоги

Выполнение: gradle: android

FAILURE: Build failed with an exception.

* What went wrong:
Configured compileSdkVersion is invalid: 21 (C:/Users/flashery/AppData/Local/Android/sdk/platforms/android-21

* 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: 1.421 secs



Build failure (see the Notifications window for stacktrace): gradle :android



Issue 1
--------

  Requested project: C:\Users\flashery\Documents\NetBeansProjects\GluonApplication

  Stack trace:
    org.gradle.tooling.BuildException: Could not execute build using Gradle distribution 'https://services.gradle.org/distributions/gradle-2.10-all.zip'.
        at org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(ResultHandlerAdapter.java:59)
        at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:57)
        at org.gradle.internal.concurrent.ExecutorPolicy$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)
        at org.gradle.tooling.internal.consumer.BlockingResultHandler.getResult(BlockingResultHandler.java:46)
        at org.gradle.tooling.internal.consumer.DefaultBuildLauncher.run(DefaultBuildLauncher.java:72)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask.runBuild(AsyncGradleTask.java:369)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask.doGradleTasksWithProgressIgnoreTaskDefCancel(AsyncGradleTask.java:492)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask.doGradleTasksWithProgressIgnoreTaskDefCancel(AsyncGradleTask.java:402)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask.doGradleTasksWithProgress(AsyncGradleTask.java:393)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask.access$400(AsyncGradleTask.java:84)
        at org.netbeans.gradle.project.tasks.AsyncGradleTask$BuildExecutionItem$1.run(AsyncGradleTask.java:775)
        at org.netbeans.gradle.project.tasks.GradleDaemonManager.runBlockingGradleTask(GradleDaemonManager.java:51)
        at org.netbeans.gradle.project.tasks.GradleDaemonManager.access$200(GradleDaemonManager.java:22)
        at org.netbeans.gradle.project.tasks.GradleDaemonManager$2.execute(GradleDaemonManager.java:128)
        at org.jtrim.concurrent.AbstractTaskExecutorService$FunctionWrapper.execute(AbstractTaskExecutorService.java:270)
        at org.jtrim.concurrent.AbstractTaskExecutorService$TaskOfAbstractExecutor.execute(AbstractTaskExecutorService.java:340)
        at org.jtrim.concurrent.Tasks$RunOnceCancelableTask.execute(Tasks.java:342)
        at org.jtrim.concurrent.ThreadPoolTaskExecutor$ThreadPoolTaskExecutorImpl$QueuedItem.runTask(ThreadPoolTaskExecutor.java:1213)
        at org.jtrim.concurrent.ThreadPoolTaskExecutor$ThreadPoolTaskExecutorImpl$Worker.executeTask(ThreadPoolTaskExecutor.java:1049)
        at org.jtrim.concurrent.ThreadPoolTaskExecutor$ThreadPoolTaskExecutorImpl$Worker.run(ThreadPoolTaskExecutor.java:1179)
        at org.jtrim.concurrent.ThreadPoolTaskExecutor$ThreadPoolTaskExecutorImpl$Worker$1.run(ThreadPoolTaskExecutor.java:998)
        at java.lang.Thread.run(Thread.java:745)
    Caused by: org.gradle.internal.exceptions.LocationAwareException: Configured compileSdkVersion is invalid: 21 (C:/Users/flashery/AppData/Local/Android/sdk/platforms/android-21
        at org.gradle.initialization.DefaultExceptionAnalyser.transform(DefaultExceptionAnalyser.java:74)
        at org.gradle.initialization.MultipleBuildFailuresExceptionAnalyser.transform(MultipleBuildFailuresExceptionAnalyser.java:47)
        at org.gradle.initialization.StackTraceSanitizingExceptionAnalyser.transform(StackTraceSanitizingExceptionAnalyser.java:30)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:101)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94)
        at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:46)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:58)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:78)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:48)
        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:47)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
        at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:66)
        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$1.run(DaemonStateCoordinator.java:246)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
        at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
    Caused by: org.gradle.api.GradleException: Configured compileSdkVersion is invalid: 21 (C:/Users/flashery/AppData/Local/Android/sdk/platforms/android-21
        at org.javafxports.jfxmobile.plugin.android.AndroidExtension.validate(AndroidExtension.groovy:106)
        at org.javafxports.jfxmobile.plugin.android.AndroidExtension$validate.call(Unknown Source)
        at org.javafxports.jfxmobile.plugin.JFXMobilePlugin.configureAndroid(JFXMobilePlugin.groovy:556)
        at org.javafxports.jfxmobile.plugin.JFXMobilePlugin.this$2$configureAndroid(JFXMobilePlugin.groovy)
        at org.javafxports.jfxmobile.plugin.JFXMobilePlugin$_apply_closure5.doCall(JFXMobilePlugin.groovy:213)
        at org.gradle.listener.ClosureBackedMethodInvocationDispatch.dispatch(ClosureBackedMethodInvocationDispatch.java:40)
        at org.gradle.listener.ClosureBackedMethodInvocationDispatch.dispatch(ClosureBackedMethodInvocationDispatch.java:25)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:44)
        at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:79)
        at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:30)
        at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
        at com.sun.proxy.$Proxy53.graphPopulated(Unknown Source)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:108)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
        at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
        at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:154)
        at org.gradle.internal.Factories$1.create(Factories.java:22)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:151)
        at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99)
        ... 42 more

Файл сборки Gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'org.javafxports:jfxmobile-plugin:1.0.8'
    }
}

apply plugin: 'org.javafxports.jfxmobile'

repositories {
    jcenter()
    maven {
        url 'http://nexus.gluonhq.com/nexus/content/repositories/releases'
    }
}

mainClassName = 'com.gluonapplication.GluonApplication'

dependencies {
    compile 'com.gluonhq:charm:3.0.0'

    androidRuntime 'com.gluonhq:charm-android:3.0.0'
    iosRuntime 'com.gluonhq:charm-ios:3.0.0'
    desktopRuntime 'com.gluonhq:charm-desktop:3.0.0'
}

jfxmobile {

    javafxportsVersion = '8.60.7'
    android {
        compileSdkVersion = '21'
        manifest = 'src/android/AndroidManifest.xml'
        androidSdk = 'C:/Users/flashery/AppData/Local/Android/sdk'
    }
    ios {
        infoPList = file('src/ios/Default-Info.plist')
        forceLinkClasses = [
                'com.gluonhq.**.*',
                'io.datafx.**.*',
                'javax.annotations.**.*',
                'javax.inject.**.*',
                'javax.json.**.*',
                'org.glassfish.json.**.*'
        ]
    }
}