How to resolve the error ' method 'dismissAnim' was called on null'?

[meditat]

E/flutter (13843): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The method 'dismissAnim' was called on null. E/flutter (13843): Receiver: null E/flutter (13843): Tried calling: dismissAnim() E/flutter (13843): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5) E/flutter (13843): #1 LoadingDismissFuture.dismiss (package:load/src/dismiss_future.dart:26:29) E/flutter (13843): #2 FutureManager.dismissAll. (package:load/src/dismiss_future.dart:45:9) E/flutter (13843): #3 List.forEach (dart:core-patch/growable_array.dart:278:8) E/flutter (13843): #4 FutureManager.dismissAll (package:load/src/dismiss_future.dart:44:22) E/flutter (13843): #5 _LoadingProviderState._realDismissDialog (package:load/src/provider.dart:122:33) E/flutter (13843): #6 _LoadingProviderState.showLoading (package:load/src/provider.dart:71:5) E/flutter (13843): #7 showLoadingDialog. (package:load/src/provider.dart:140:35) E/flutter (13843): #8 new Future.delayed. (dart:async/future.dart:316:39) E/flutter (13843): #9 _rootRun (dart:async/zone.dart:1120:38) E/flutter (13843): #10 _CustomZone.run (dart:async/zone.dart:1021:19) E/flutter (13843): #11 _CustomZone.runGuarded (dart:async/zone.dart:923:7) E/flutter (13843): #12 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:963:23) E/flutter (13843): #13 _rootRun (dart:async/zone.dart:1124:13) E/flutter (13843): #14 _CustomZone.run (dart:async/zone.dart:1021:19) E/flutter (13843): #15 _CustomZone.bindCallback. (dart:async/zone.dart:947:23) E/flutter (13843): #16 Timer._createTimer. (dart:async-patch/timer_patch.dart:21:15) E/flutter (13843): #17 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19) E/flutter (13843): #18 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5) E/flutter (13843): #19 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:171:12) E/flutter (13843): W/BiChannelGoogleApi(13843): [FirebaseAuth: ] getGoogleApiForMethod() returned Gms: com.google.firebase.auth.api.internal.zzak@7dd7cf1 E/JavaBinder(13843): *** Uncaught remote exception! (Exceptions are not yet supported across processes.) E/JavaBinder(13843): java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/util/ArrayMap; E/JavaBinder(13843): at com.google.firebase.auth.internal.zzam.zzc(Unknown Source:22) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzam.zzde(Unknown Source:17) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzam.zzdd(Unknown Source:8) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzan.zzdf(Unknown Source:1) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzm.isAnonymous(Unknown Source:47) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzat.zzi(Unknown Source:57) E/JavaBinder(13843): at com.google.firebase.auth.internal.zzat.zzg(Unknown Source:10) E/JavaBinder(13843): at com.google.firebase.auth.FirebaseAuth.zza(Unknown Source:62) E/JavaBinder(13843): at com.google.firebase.auth.FirebaseAuth$zzb.zza(Unknown Source:5) E/JavaBinder(13843): at com.google.firebase.auth.api.internal.zzcv.zzdx(Unknown Source:14) E/JavaBinder(13843): at com.google.firebase.auth.api.internal.zzen.zzen(Unknown Source:35) E/JavaBinder(13843): at com.google.firebase.auth.api.internal.zzen.zza(Unknown Source:41) E/JavaBinder(13843): at com.google.firebase.auth.api.internal.zzep.zza(Unknown Source:9) E/JavaBinder(13843): at com.google.firebase.auth.api.internal.zzdx.dispatchTransaction(Unknown Source:9) E/JavaBinder(13843): at com.google.android.gms.internal.firebase_auth.zza.onTransact(Unknown Source:13) E/JavaBinder(13843): at android.os.Binder.execTransact(Binder.java:731) E/JavaBinder(13843): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.util.ArrayMap" on path: DexPathList[[zip file "/data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/base.apk"],nativeLibraryDirectories=[/data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/lib/arm64, /data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/base.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]] E/JavaBinder(13843): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134) E/JavaBinder(13843): at java.lang.ClassLoader.loadClass(ClassLoader.java:379) E/JavaBinder(13843): at java.lang.ClassLoader.loadClass(ClassLoader.java:312) E/JavaBinder(13843): ... 16 more E/AndroidRuntime(13843): FATAL EXCEPTION: Binder:13843_4 E/AndroidRuntime(13843): Process: in.medit.volt_userapp, PID: 13843 E/AndroidRuntime(13843): java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/util/ArrayMap; E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzam.zzc(Unknown Source:22) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzam.zzde(Unknown Source:17) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzam.zzdd(Unknown Source:8) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzan.zzdf(Unknown Source:1) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzm.isAnonymous(Unknown Source:47) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzat.zzi(Unknown Source:57) E/AndroidRuntime(13843): at com.google.firebase.auth.internal.zzat.zzg(Unknown Source:10) E/AndroidRuntime(13843): at com.google.firebase.auth.FirebaseAuth.zza(Unknown Source:62) E/AndroidRuntime(13843): at com.google.firebase.auth.FirebaseAuth$zzb.zza(Unknown Source:5) E/AndroidRuntime(13843): at com.google.firebase.auth.api.internal.zzcv.zzdx(Unknown Source:14) E/AndroidRuntime(13843): at com.google.firebase.auth.api.internal.zzen.zzen(Unknown Source:35) E/AndroidRuntime(13843): at com.google.firebase.auth.api.internal.zzen.zza(Unknown Source:41) E/AndroidRuntime(13843): at com.google.firebase.auth.api.internal.zzep.zza(Unknown Source:9) E/AndroidRuntime(13843): at com.google.firebase.auth.api.internal.zzdx.dispatchTransaction(Unknown Source:9) E/AndroidRuntime(13843): at com.google.android.gms.internal.firebase_auth.zza.onTransact(Unknown Source:13) E/AndroidRuntime(13843): at android.os.Binder.execTransact(Binder.java:731) E/AndroidRuntime(13843): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.util.ArrayMap" on path: DexPathList[[zip file "/data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/base.apk"],nativeLibraryDirectories=[/data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/lib/arm64, /data/app/in.medit.volt_userapp-FbtZAlDevc3wgpZoum27zg==/base.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]] E/AndroidRuntime(13843): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134) E/AndroidRuntime(13843): at java.lang.ClassLoader.loadClass(ClassLoader.java:379) E/AndroidRuntime(13843): at java.lang.ClassLoader.loadClass(ClassLoader.java:312) E/AndroidRuntime(13843): ... 16 more

[CaiJingLong]

How to reproduce it?

Are you wrap the MaterialApp with LoadingProvider?

[meditat]

Yes, I got the issue, thanks

[ag12216]

Before showing Loading just check network is available or not then only show as it is called before the render