whenever I call the function. I got the error below.

flutter: The method 'toDouble' was called on null. flutter: Receiver: null flutter: Tried calling: toDouble()

I noticed that

screenWidth = _mediaQueryData.size.width; screenHeight = _mediaQueryData.size.height;

these data return null

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quando passo dentro do ontap na pagina item card nao aceita e se coloco () na frente trava na hora de conpilar Exception has occurred. _AssertionError ('package:flutter/src/widgets/navigator.dart': Failed assertion: line 4437 pos 12: '!_debugLocked': is not true.) alguem me ajude

hi, help me solve this

Launching lib\main.dart on Android SDK built for x86 in debug mode... /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.18.1/lib/src/picture_provider.dart:50:59: Error: No named parameter with the name 'nullOk'. context != null ? Localizations.localeOf(context, nullOk: true) : null, ^^^^^^ /C:/src/flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found this candidate, but the arguments don't match.

static Locale localeOf(BuildContext context) { ^^^^^^^^

FAILURE: Build failed with an exception.

• Where: Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1070

• What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'.

Process 'command 'C:\src\flutter\bin\flutter.bat'' finished with non-zero exit value 1

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org BUILD FAILED in 15s Exception: Gradle task assembleDebug failed with exit code 1 Exited (sigterm)

i have updated dependency，

android studio version 2021.1.1 Canary 11 flutter version 2.5

debug error message:

Launching lib/main.dart on sdk gphone x86 arm in debug mode... Running Gradle task 'assembleDebug'... ../../flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.18.1/lib/src/picture_provider.dart:50:59: Error: No named parameter with the name 'nullOk'. context != null ? Localizations.localeOf(context, nullOk: true) : null, ^^^^^^ ../../flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found this candidate, but the arguments don't match. static Locale localeOf(BuildContext context) { ^^^^^^^^

FAILURE: Build failed with an exception.