我尝试为我的应用程序使用FolioReader库。但是出现错误。
这是错误：
07-27 19:17:05.196 2651-2651/com.edep.myereader E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.edep.myereader, PID: 2651
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.edep.myereader/com.folioreader.ui.folio.activity.FolioActivity}: java.lang.NullPointerException: Attempt to read from field 'java.util.List org.readium.r2_streamer.model.publication.EpubPublication.links' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to read from field 'java.util.List org.readium.r2_streamer.model.publication.EpubPublication.links' on a null object reference
at org.readium.r2_streamer.server.EpubServer.addLinks(EpubServer.java:69)
at org.readium.r2_streamer.server.EpubServer.addEpub(EpubServer.java:42)
at com.folioreader.ui.folio.activity.FolioActivity.addEpub(FolioActivity.java:208)
at com.folioreader.ui.folio.activity.FolioActivity.initBook(FolioActivity.java:196)
at com.folioreader.ui.folio.activity.FolioActivity.setupBook(FolioActivity.java:516)
at com.folioreader.ui.folio.activity.FolioActivity.onCreate(FolioActivity.java:141)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
这是库链接：https://github.com/FolioReader/FolioReader-Android
我该如何解决？ 谢谢您的帮助。