java.lang.AbstractMethodError: abstract method "void com.google.firebase.database.ChildEventListener.onCancelled(com.google.firebase.database.DatabaseError)" com.tns.Runtime.callJSMethodNative(Native Method) com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:861) com.tns.Runtime.callJSMethodImpl(Runtime.java:726) com.tns.Runtime.callJSMethod(Runtime.java:712) com.tns.Runtime.callJSMethod(Runtime.java:693) com.tns.Runtime.callJSMethod(Runtime.java:683) com.tns.gen.com.google.firebase.database.ChildEventListener.onCancelled(ChildEventListener.java:38) com.google.android.gms.internal.zzahh.zza(Unknown Source) com.google.android.gms.internal.zzajf.zzctc(Unknown Source) com.google.android.gms.internal.zzajk$1.run(Unknown Source) android.os.Handler.handleCallback(Handler.java:815) android.os.Handler.dispatchMessage(Handler.java:104) android.os.Looper.loop(Looper.java:194) android.app.ActivityThread.main(ActivityThread.java:5643) java.lang.reflect.Method.invoke(Native Method) java.lang.reflect.Method.invoke(Method.java:372) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) File: "<unknown>, line: 0, column: -1 StackTrace:

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) android.os.Handler.handleCallback(Handler.java:815) android.os.Handler.dispatchMessage(Handler.java:104) android.os.Looper.loop(Looper.java:194) android.app.ActivityThread.main(ActivityThread.java:5643
java.lang.AbstractMethodError: abstract method "void com.google.firebase.database.ChildEventListener.onCancelled(com.google.firebase.database.DatabaseError)" com.tns.Runtime.callJSMethodNative(Native Method) com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:861) com.tns.Runtime.callJSMethodImpl(Runtime.java:726) com.tns.Runtime.callJSMethod(Runtime.java:712) com.tns.Runtime.callJSMethod(Runtime.java:693) com.tns.Runtime.callJSMethod(Runtime.java:683) com.tns.gen.com.google.firebase.database.ChildEventListener.onCancelled(ChildEventListener.java:38) com.google.android.gms.internal.zzahh.zza(Unknown Source) com.google.android.gms.internal.zzajf.zzctc(Unknown Source) com.google.android.gms.internal.zzajk$1.run(Unknown Source) android.os.Handler.handleCallback(Handler.java:815) android.os.Handler.dispatchMessage(Handler.java:104) android.os.Looper.loop(Looper.java:194) android.app.ActivityThread.main(ActivityThread.java:5643) java.lang.reflect.Method.invoke(Native Method) java.lang.reflect.Method.invoke(Method.java:372) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) File: "<unknown>, line: 0, column: -1 StackTrace:
at com.tns.Runtime.callJSMethodNative(Native Method)
at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:861)
at com.tns.Runtime.callJSMethodImpl(Runtime.java:726)
at com.tns.Runtime.callJSMethod(Runtime.java:712)
at com.tns.Runtime.callJSMethod(Runtime.java:693)
at com.tns.Runtime.callJSMethod(Runtime.java:683)
at com.tns.gen.com.google.firebase.database.ChildEventListener.onCancelled(ChildEventListener.java:38)
at com.google.android.gms.internal.zzahh.zza(Unknown Source)
at com.google.android.gms.internal.zzajf.zzctc(Unknown Source)
at com.google.android.gms.internal.zzajk$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5643)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)

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