Flutter SharedPreferences & FlutterToast MissingPluginException

Question

I'm facing an issue after building my Flutter app (especially in release mode). The app crashes or throws the following errors related to SharedPreferences and FlutterToast plugins.

I/flutter (10569): SharedPreferences init failed: 
PlatformException(channel-error, Unable to establish connection on channel: "dev.flutter.pigeon.shared_preferences_android.SharedPreferencesApi.getAll", null, null)

I/flutter (10569): user auth permission

E/flutter (10569): [ERROR:flutter/runtime/dart_vm_initializer.cc(40)] 
Unhandled Exception: MissingPluginException(No implementation found for method showToast on channel PonnamKarthik/fluttertoast)
E/flutter (10569): #0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:365)

Flutter version: 3.35.7

Plugins used:

shared_preferences: ^2.5.3
fluttertoast: ^9.0.0

Did you Google the error? github.com/ponnamkarthik/FlutterToast/issues/… — Mostafa Soliman
– Mostafa Soliman, Commented Nov 3 at 12:47
What fixes do you try? Did you try flutter clean before you build? Do you use ProGuard rules in your app? — Mostafa Soliman
– Mostafa Soliman, Commented Nov 3 at 12:48
Yes, I already tried running flutter clean before building. And yes, my app also uses ProGuard rules. I’ve added the required keep rules for Play Core, Flutter Sound, and other plugins. Still getting the same MissingPluginException and PlatformException errors in release build. @MostafaSoliman — Usama Qadeer
– Usama Qadeer, Commented Nov 4 at 3:32
@MostafaSoliman Yes, I already tried flutter clean before building, and I’m using ProGuard rules in my app. I also added this rule for Flutter Toast: -keep class io.github.ponnamkarthik.toast.** { *; } But it still didn’t fix the issue — I’m still getting the same errors in the release build. — Usama Qadeer
– Usama Qadeer, Commented Nov 4 at 3:59

Kalantos · Accepted Answer · 2025-11-06 14:40:00Z

0

You are probably trying to initialize SharedPreferences & Toast before the runApp happen (in your main) if that's the case this should solve your issue:

Add this to the begining of your main:

WidgetsFlutterBinding.ensureInitialized();

This will start the Native Binding process before, ensuring is ready when you call the plugins

answered Nov 6 at 14:40

Kalantos

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