我正在使用Android應用（從Firebase實時數據庫）使用Firestore。我遇到了一個很難解決的問題。這是來自logcat的錯誤：07-14 20:42:32.565 13093-13093/com.aayaffe.sailingracecoursemanager E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.aayaffe.sailingracecoursemanager, PID: 13093    java.lang.RuntimeException: Internal error in Firestore (0.6.6-dev).        at com.google.firebase.firestore.g.zza.zzb(SourceFile:324)        at com.google.firebase.firestore.g.zzd.run(Unknown Source)        at android.os.Handler.handleCallback(Handler.java:739)        at android.os.Handler.dispatchMessage(Handler.java:95)        at android.os.Looper.loop(Looper.java:158)        at android.app.ActivityThread.main(ActivityThread.java:7224)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)     Caused by: java.lang.NoClassDefFoundError: com.google.common.base.CharMatcher        at com.google.common.base.Splitter.on(Splitter.java:119)        at io.grpc.internal.GrpcUtil.<clinit>(GrpcUtil.java:200)        at io.grpc.internal.AbstractManagedChannelImplBuilder.<clinit>(AbstractManagedChannelImplBuilder.java:81)        at io.grpc.okhttp.OkHttpChannelBuilder.forTarget(OkHttpChannelBuilder.java:137)        at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java:48)        at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java:27)        at io.grpc.ManagedChannelBuilder.forTarget(ManagedChannelBuilder.java:70)        at com.google.firebase.firestore.f.zzd.<init>(SourceFile:88)        at com.google.firebase.firestore.b.zzf.zza(SourceFile:1217)        at com.google.firebase.firestore.b.zzh.run(Unknown Source)嘗試從數據庫讀取數據時，顯然會發(fā)生此問題，但我不確定。我發(fā)現了一件事。此問題發(fā)生在Android版本6.0.1上，而不是在Android版本8.0.0上