Error map
No Material widget found Flutter: No Material widget found. TextField widgets require a Material widget ancestor
Flutter / Dart · layer 1, On your device
Centre: this error. First ring: errors it is linked with (9). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (9)
Flutter: A RenderFlex overflowed by x pixels on the right/bottom
A Row or Column’s children need more space than available, so Flutter draws the yellow-black overflow stripes.
Flutter: BoxConstraints forces an infinite width. These invalid constraints were provided to RenderStack's layout() function (TextField in a Row)
A widget that needs a finite width, like a `TextField` or `Container` with no size, was placed where the parent offers unlimited…
Flutter: Scaffold.of() called with a context that does not contain a Scaffold
You called `Scaffold.of(context)` (or `ScaffoldMessenger`) using the same `BuildContext` that created the Scaffold, which is abov…
Flutter (Android): java.io.IOException: Cleartext HTTP traffic to api.example.com not permitted
Android 9+ blocks plain `http://` requests by default; the app must use HTTPS or explicitly allow cleartext for that host.
Flutter test: Expected: exactly one matching candidate Actual: _TextFinder:<Found 0 widgets with text "Hello">
A widget test looked for a widget that is not currently in the tree.
Android Gradle: Execution failed for task ':app:checkDebugAarMetadata'. Dependency requires libraries and applications that depend on it to compile against version 34 or later of the Android APIs
A dependency was built against a newer Android API than your project's `compileSdk`.
Flutter: MediaQuery.of() called with a context that does not contain a MediaQuery
Code asked for screen size or theme data using a context that has no MediaQuery ancestor, usually above or outside `MaterialApp`.
Flutter: Navigator operation requested with a context that does not include a Navigator
`Navigator.push/pop` was called with a context above the `MaterialApp`, so no Navigator exists in the lookup path.
flutter doctor: Android license status unknown. Run `flutter doctor --android-licenses` to accept the SDK licenses
The Android SDK licenses have not been accepted, so builds cannot download or use SDK components.
Two steps away (20)
Jetpack Compose: Vertically scrollable component was measured with an infinity maximum height constraints, which is disallowed
A LazyColumn (or verticalScroll) is placed inside another vertically scrolling container, so it gets infinite height.
Flutter: setState() called after dispose(): _MyState#1a2b3 (lifecycle state: defunct, not mounted)
An async callback (network, timer, stream) finished after the widget was removed and then called setState.
Dart/Flutter: Null check operator used on a null value
The ! operator was applied to a variable that was null at runtime.
Flutter: RenderBox was not laid out: RenderFlex#a1b2c relayoutBoundary=up2 NEEDS-PAINT — Failed assertion: 'hasSize'
A widget was asked for its size or painted before layout finished, usually because a parent gave it unbounded or conflicting cons…
Flutter: Vertical viewport was given unbounded height. Viewports expand in the scrolling direction to fill their container
A scrollable (ListView, GridView) sits inside a parent that does not limit its height, so it tries to be infinitely tall.
Flutter: Incorrect use of ParentDataWidget. The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject
A widget like `Expanded`, `Flexible`, `Positioned` or `TableCell` was placed under a parent that does not support it.
Flutter: Looking up a deactivated widget's ancestor is unsafe. At this point the state of the widget's element tree is no longer stable
You used a `BuildContext` after its widget was removed from the tree — typically after an `await` when the user already navigated…
android.os.NetworkOnMainThreadException
The app made a network call on the main (UI) thread, which Android forbids.
Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline."
URLSession couldn’t reach the network — the device is offline, the app’s cellular data is disabled, or the simulator lost network…
Error Domain=NSURLErrorDomain Code=-1001 "The request timed out."
The server didn’t respond within URLSession’s timeout (60 s default) — slow server, unreachable host on this network, or a stalle…
Flutter test: A Timer is still pending even after the widget tree was disposed
A widget test finished while a `Timer` or delayed `Future` was still scheduled.
Gradle: Could not resolve all files for configuration / Could not resolve dependency
Gradle couldn’t download a dependency — wrong coordinates/version, missing repository, offline mode, or network/proxy issues.
Manifest merger failed: android:exported needs to be explicitly specified
Targeting Android 12 (API 31)+ requires `android:exported` on every activity, service or receiver that has an intent-filter.
Duplicate class X found in modules A and B
Two dependencies ship the same class — typically old Android Support libraries mixed with AndroidX, or Kotlin stdlib-jdk7/jdk8 ve…
Flutter: Error: Could not find the correct Provider<CartModel> above this Consumer<CartModel> Widget
A widget asked Provider for an object that is not above it in the widget tree.
Flutter: dependOnInheritedWidgetOfExactType<_InheritedTheme>() or dependOnInheritedElement() was called before _HomeState.initState() completed
`Theme.of(context)`, `MediaQuery.of(context)` or `Provider.of(context)` was used in `initState`, where inherited widgets are not…
Flutter: There are multiple heroes that share the same tag within a subtree
Two `Hero` widgets with the same tag exist on one screen during a route transition.
adb server version (41) doesn't match this client (39); killing...
Two different adb binaries are running — e.g. Android Studio’s SDK adb and another one on PATH (Homebrew, Genymotion, older SDK).
SDK location not found. Define a valid SDK location with an ANDROID_HOME environment variable or by setting the sdk.dir path in local.properties
Gradle doesn’t know where the Android SDK is installed.
IllegalStateException: Default FirebaseApp is not initialized in this process
Firebase couldn’t initialise because google-services.json or the Google Services Gradle plugin is missing/misapplied, or initiali…
Map another error
Popular: 500403400ORA-009331064Critical errorFileNotFoundException assemblyTypeError