ErrLookup › dotnet/maui
dotnet/maui
.NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop. · C# · 5,630 source files
Analyzed at f377ff1c5e on 2026-08-13. 321 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| ItemTemplate count has exceeded the limit of | exception | error | maui, android, listview, datatemplate, datatemplateselector, legacy-renderers, viewtypecount |
| Could not find or create a renderer for | exception | error | rendering, renderer-registration, winui, uwp, maui-compatibility |
| Binding and Value found for | exception | error | datatemplate, binding, xaml, invalidoperation |
| oldElement | exception | error | argumentnullexception, ios, renderer-pool, compatibility, obsolete |
| Unexpected navigation type | exception | error | maui, android, shell, navigation, renderer |
| Value is an invalid value for | exception | error | maui, coerce, validation, argument, bindableproperty |
| Cert exists in LocalMachine\TrustedPeople but its private… | exception | error | cake, windows, certificate, msix, elevation, x509 |
| IsHeadless cannot be modified when the view is rendered | exception | warning | maui, layout, obsolete, lifecycle, compressed-layout |
| Unsupported path part type | exception | error | source-generator, bindings, compilation, internal, csharp |
| ParentingViewController parent could not be found. Please… | exception | error | maui, ios, navigation, navigationpage, concurrency, renderer |
| This should never happen, please file a bug | exception | error | gtk, navigationpage, invariant, concurrency, renderer, maui |
| Popped page does not appear on top of current navigation… | exception | error | maui, ios, navigation, navigationpage, concurrency, renderer |
| Call to SetBinding< , > could not be intercepted because… | exception | error | maui, data-binding, source-generators, msbuild, feature-switch |
| No test assembly found. | exception | error | cake, reflection, build-artifacts, device-tests, maui |
| binding | exception | error | maui, binding, argument-null, nullable |
| View for cell must implement INativeElementView to enable… | exception | error | android, listview, recycling, renderer, xamarin-forms |
| Active Shell Item not set. Have you added any Shell Items… | exception | error | maui, android, shell, renderer, fragment |
| Unable to find the required services. Please add all the… | exception | error | blazor, blazorwebview, maui, android, dependency-injection, service-registration |
| Member ' ' with inaccessible accessor must have MemberType… | exception | error | source-generator, bindings, unsafe-accessors, internal, csharp |
| MauiContext not set | exception | error | maui, renderer, mauicontext, lifecycle, initialization |
| NavigationPage must have a root Page before being used… | exception | error | macos, navigationpage, renderer, lifecycle, maui, xamarin |
XC0040 Cannot convert value | error_code | error | xaml, maui, xamlc, type-converter, cornerradius, build-time |
| Shell Content Page is Null | exception | error | maui, android, shell, datatemplate, di, renderer |
| Temporary removed exception message | exception | error | wpf, transitions, visual-state, argument, placeholder-message |
| Can't start BlazorWebView without native web view instance. | exception | error | blazor, blazorwebview, maui, android, handler-lifecycle, platform-view |
| PopToRootAsync is not supported globally on GTK, please use… | exception | error | gtk, navigation, navigationpage, platform-limitation, maui, xamarin |
| Default value did not match return type. Property | exception | error | maui, bindableproperty, argument-validation, type-mismatch, default-value |
| Test categories file was not created during discovery phase | exception | error | cake, windows, winui, packaged, test-categories, discovery |
| Namescopes are not supported. Please enable the feature… | exception | error | maui, namescope, feature-switch, xaml, trimming |
| RecycleElementAndDataTemplate requires DataTemplate… | exception | error | listview, datatemplate, caching, recycle, notsupported |
XC0004 Missing default constructor for | error_code | error | xaml, maui, xamlc, resourcedictionary, constructor, build-time |
| New element must be a CarouselPage | exception | error | gtk, renderer, carousel, type-mismatch, maui, xamarin |
| The Map.ItemTemplate property only supports DataTemplate… | exception | error | maui, maps, datatemplate, datatemplateselector, not-supported, itemtemplate |
| call Forms.Init() before this | exception | error | macos, initialization, forms, lifecycle, maui, xamarin |
| renderer | exception | error | maui, ios, renderer, argument-null, visual-element-tracker |
| Error: Couldn't find .exe file | exception | error | cake, build, windows, path-resolution, configuration |
| ImageElementManager.SetImage renderer cannot be null | exception | error | argumentnullexception, ios, image, async, renderer-disposal |
| Index ' ' is greater than the number of rows ' '. | exception | error | argumentexception, ios, listview, collection-changed, threading, retain-element |
| RootComponent requires a value for its Selector property… | exception | error | blazor, blazorwebview, maui, rootcomponent, validation, xaml |
| View for cell must implement | exception | error | android, listview, recycle, viewcell, caching-strategy, maui-compat |
| BindableObject was not instantiated on a thread with a… | exception | error | dispatcher, threading, invalidoperation, uithread |
| DisplayMemberName is not supported. Consider implementing… | exception | error | maui, ios, shell, search, trimming, nativeaot, csproj |
| Unable to find the required services. Please add all the… | exception | error | blazor, blazorwebview, winforms, dependency-injection, service-registration, webview2 |
| Cannot apply relative binding to | exception | error | maui, data-binding, relative-binding, element-tree, invalidoperation |
| Activity OnCreate was not called prior to loading the… | exception | critical | android, activity, lifecycle, oncreate, initialization |
| must be of type | exception | error | android, renderer, type-mismatch, collectionview, maui-compat |
XC0003 Missing mandatory property | exception | error | xaml, maui, xamlc, markup-extension, datatemplate, property-missing, build-time |
| InsertPageBefore is not supported globally on Android… | exception | error | android, navigation, insertpagebefore, navigationpage, platform |
| Unknown cell parent type | exception | error | maui, ios, cell, listview, tableview, compatibility |
| Handler is already being set elsewhere | exception | error | maui, handler, reentrancy, invalidoperation, lifecycle |
| No test result files found. All test processes may have… | exception | error | cake, windows, test-results, validation, device-tests |
| Content not found for active | exception | error | maui, ios, shell, renderer |
| Cannot convert to . | exception | info | flowdirection, deadcode, unreachable, rtl |
| ToolbarResource must be set to a… | exception | error | android, toolbar, layout-inflation, androidx, appcompat |
| renderer must be a Page renderer. | exception | error | maui, ios, tabbedpage, renderer, type-mismatch |
| Cannot convert " " into | exception | error | typeconverter, datetime, dateonly, xaml, parsing |
| Unable to find a TragetType for the Bindable Property. Try… | exception | error | maui, xaml, visualstate, converter, style, targettype |
| Some test categories failed to complete | exception | error | cake, windows, test-results, categories, timeout, device-tests |
| Cannot call CreateContent directly on a DataTemplateSelector | exception | error | maui, datatemplate, xaml, controls |
| Not a valid type of BindingMode. Property | exception | error | maui, bindableproperty, argument-validation, enum, binding-mode |
| Reuse of the Shell Renderer is not supported | exception | error | maui, ios, shell, renderer, lifecycle |
| DataTemplateSelector.OnSelectTemplate must not return… | exception | error | datatemplateselector, datatemplate, listview, notsupported |
| key | exception | error | maui, dynamic-resource, argument-null, resource-key |
| Element IList .this[int index] | exception | warning | maui, readonly-collection, logicalchildren, notsupported, hot-reload |
| No simulator was found to run tests on. | exception | error | cake, ios, simulator, xharness, udid |
| Implement INativeElementView on cell renderer | exception | error | maui, xamarin-forms, ios, cell-renderer, context-actions, invalidoperation |
| Can't start BlazorWebView without platform web view… | exception | error | blazor, blazorwebview, maui, tizen, handler-lifecycle, platform-view |
| throw new ArgumentOutOfRangeException(); | exception | error | maui, effects, collectionchanged, argumentoutofrange, defensive |
| AppLinkUri | exception | error | maui, ios, applinks, core-spotlight, argument-null |
| Detail must be set before using a FlyoutPage | exception | error | maui, flyoutpage, renderers, layout |
XC0000 Cannot resolve type " ". | exception | error | xaml, maui, xamlc, markup-extension, datatemplate, type-resolution, build-time |
XC0063 Multi-valued enums are not valid on sbyte enum types. | exception | error | xaml, xamlc, enum, flags, sbyte |
| LoadView must be called before accessing View | exception | error | maui, android, shell, search, renderer, lifecycle |
| IConnectionPoint::Advise returned an invalid cookie. | exception | error | wpf, com, interop, connection-point, events |
| Unable to get window from parent view controller | exception | error | maui, maccatalyst, embedding, uikit, uiwindow, lifecycle |
| AppLinkEntry Thumbnail must be set to a valid source | exception | error | maui, ios, applinks, core-spotlight, image-source, thumbnail |
| Call Forms.Init (Activity, Bundle) before this | exception | critical | android, forms-init, initialization, lifecycle |
| The BindableProperty | exception | error | maui, coerce, readonly, invalidoperation, bindableproperty |
| This is an async test exception thrown from C# code! | exception | info | hybridwebview, sample, async, exception-handling, csharp |
| type is not a Foregroundable type | exception | error | wpf, maui-compatibility, foreground, dependencyproperty, reflection |
| Unable to find the required services. Please add all the… | exception | error | blazor, blazorwebview, wpf, dependency-injection, service-registration, webview2 |
| 'selector' cannot be null or whitespace. | exception | error | blazor, blazorwebview, winforms, rootcomponent, validation, constructor |
| Call to SetBinding< , > was not intercepted. | exception | error | maui, data-binding, source-generators, lambda, interceptor |
| Cannot apply relative binding when the target object is… | exception | error | maui, data-binding, relative-binding, nullable, lifecycle |
| Some tests failed. Check the logs or test results. | exception | error | tests, aggregate, cake, test-runner |
| Unable to load system image 'macwindow.badge.plus' | exception | error | maui, ios, uikit, sf-symbols, system-image, asset, platform-specific |
| Can't resolve | exception | error | maui, xaml, bindableproperty, converter, setter |
| At least test(s) failed in . | exception | error | cake, windows, test-results, xunit, assertion-failure, device-tests |
| Failed to install signing cert into… | exception | error | cake, windows, certificate, msix, elevation, first-run |
| RootComponent requires a value for its ComponentType… | exception | error | blazor, blazorwebview, maui, rootcomponent, validation, xaml |
| ItemTemplate count has exceeded the limit of | exception | error | android, listview, datatemplate, memory, adapter, perf, maui-compat |
| Unable to create a device context from the specified device… | exception | critical | wpf, gdi, native-interop, device-context, systemexception |
| is not compatible. element must be of type… | exception | error | maui, android, material, renderer, type-mismatch, activity-indicator |
| Error: Couldn't find .cer or .msix file | exception | error | cake, windows, msix, build-artifacts, packaging, certificate |
| PopAsync is not supported globally on macOS, please use a… | exception | error | macos, navigation, navigationpage, platform-limitation, maui, xamarin |
| Cannot assign a native control without an Element; Renderer… | exception | error | rendering, lifecycle, disposal, winui, race-condition |
| Call to Create< , > could not be intercepted because the… | exception | error | maui, binding, source-generator, interceptor, configuration |
| Call to Create< , >() was not intercepted. | exception | error | maui, binding, source-generator, interceptor, configuration |
| Expected but found . | exception | error | maui, xaml, visualstate, converter, setter, markup-structure |
| PowerShell Core (pwsh) is required on non-Windows… | exception | error | pwsh, powershell, non-windows, environment, dependency |