fenster错误显示java.lang.UnsupportedOperationException：不支持的服务：音频

Question

在xml中显示如下错误。

java.lang.UnsupportedOperationException: Unsupported Service: audio   at com.android.layoutlib.bridge.android.BridgeContext.getSystemService(BridgeContext.java:602)   at com.malmstein.fenster.seekbar.VolumeSeekBar.initialise(VolumeSeekBar.java:78)   at com.malmstein.fenster.controller.MediaFensterPlayerController.initControllerView(MediaFensterPlayerController.java:205)   at com.malmstein.fenster.controller.MediaFensterPlayerController.onFinishInflate(MediaFensterPlayerController.java:174)   at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:867)   at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)   at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)   at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)   at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:861)   at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)   at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)   at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)   at android.view.LayoutInflater.inflate(LayoutInflater.java:518)   at android.view.LayoutInflater.inflate(LayoutInflater.java:397) Copy stack to clipboard  Tip: Try to refresh the layout. 

我添加了build.gradle（模块应用）

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    testCompile 'junit:junit:4.12'
    compile 'com.malmstein:fenster:0.0.2'
}

我已经在build.gradle中添加了（项目：名称）

buildscript {
    repositories {
        jcenter()

    }

    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.2'
        classpath 'com.google.gms:google-services:3.0.0'
        classpath 'com.malmstein:fenster:0.0.2'
    }
}

allprojects {
    repositories {
        jcenter()
        mavenCentral()
        maven { url "https://jitpack.io" }
    }

}

task clean(type: Delete) {
    delete rootProject.buildDir
}

如何解决此错误