ErrLookup › unoplatform/uno
unoplatform/uno
Open-source platform for building cross-platform native Mobile, Web, Desktop, and Embedded apps from a single C#/XAML codebase. Work from any IDE/CLI with Hot Reload, Visual Designer, MCPs, and Skills built for modern .NET workflows. 200M+ NuGet downloads. · C# · 16,928 source files
Analyzed at 0418340488 on 2026-08-13. 218 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| Error, NavigationViewItem.IsSelected should be true before… | validation | error | navigationview, winui, selection, event-ordering, isselected, uno-platform, virtualization |
| Cannot resolve runtime type from XML namespace | exception | error | xaml, type-resolution, clr-namespace, source-generators |
| StepBackwardOneFrame is not supported | exception | error | media, wasm, notsupported, mediaplayer |
| ' ' is not defined on | exception | error | xaml, source-generator, style, resource-dictionary, build |
| MediaPlayerPresenterExtension must be initialized with a… | exception | error | media, type-guard, extension, misuse |
| The framebuffer readback failed with | exception | error | opengl, glcanvaselement, readback, driver, graphics |
| type | exception | error | wasm, typescript, source-generator, emscripten, bindings, nullable |
| GLCanvasElement.IsGLInitializedProperty is read-only. | exception | error | opengl, glcanvaselement, dependencyproperty, readonly, misuse |
| The default LookupPositionalParameters implementation does… | exception | error | xaml, markup-extension, reflection, positional-parameters |
| retrieveFiles failed to find pending drag and drop data for… | exception | error | wasm, drag-and-drop, browser, typescript, skia-wasm-browser |
| MapBufferRange(PixelPackBuffer) returned null | exception | error | opengl, silk-net, pbo, map-buffer, android, ios, gl-es, mobile |
| Unable to implicitly initialize collection for | exception | error | xaml, content-property, collection, source-generator, build |
| This platform does not support SKCanvasElement. For more… | exception | error | skia, graphics, skcanvaselement, platform, platformnotsupported |
| Unable to find x:Class on the top level element | exception | error | xaml, source-generator, x-class, build, diagnostics |
| PBO round-trip mismatch at byte | exception | error | opengl, silk-net, pbo, readback, data-integrity, pixel-format |
| Couldn't find GLibrary in WebKitGtkSharp | exception | error | x11, linux, webview, webkitgtk, reflection, native-interop |
| StepForwardOneFrame is not supported | exception | error | media, wasm, notsupported, mediaplayer |
| No function was found with the name | exception | error | opengl, windows, wgl, extension, native-interop |
| Invalid value ' ', unable to parse. | validation | error | gridlength, parsing, samples, uitests, regex |
| cmap table not found | exception | error | font, build-tool, fontfallbackpreprocessor, truetype, cmap |
| Failed to create an instance of SKCanvasVisualBase | exception | error | skia, graphics, skcanvaselement, platform, extension |
| Error compiling shader of type | exception | error | opengl, silk-net, glsl, shader-compile, diagnostics, shader, false-positive |
| MSBuild property MSBuildProjectFullPath value | exception | error | msbuild, source-generator, build-config, project-path |
| Unable to find x:DataType in enclosing DataTemplate for… | exception | error | xaml, x-bind, data-template, x-datatype, build |
| Owner must be a SvgImageSource instance. | exception | error | svg, type-guard, extension, misuse |
| Readback FBO is not complete | exception | critical | opengl, silk-net, fbo, framebuffer, rendering, gl-es, webgl |
| wglCreateContext failed | exception | critical | opengl, windows, wgl, native-interop, context |
| Unable to find the type | exception | error | xaml, x-bind, x-class, type-resolution, build |
| Value type is ' ' but it must be either string or any type… | exception | error | xaml, serialization, type-converter, value-serializer, xamlwriter |
| Failed load the animation | exception | error | lottie, skottie, exception-wrapping, animation, uno-platform |
| PInvoke.RegisterClassEx failed | exception | critical | win32, media-player, libvlc, skia, windows, uno-platform |
| Unable to find class name for toplevel control | exception | error | xaml, source-generator, x-class, build |
| FoldableHingeAngleSensor must be initialized on the UI… | exception | error | android, foldable, sensors, ui-thread, csharp, add-in |
| Failed to load | exception | error | navigation, uno-template, frame, app-lifecycle, boilerplate |
| The type ' ' could not be found | exception | error | xaml, type-resolution, xmlns, build |
| Activity must provide lifecycle events. | exception | error | android, foldable, lifecycle, jetpack-window-manager, csharp, add-in |
| Failed to load animation. | exception | error | lottie, skottie, animation, parsing, uno-platform |
| Couldn't find a field named _libraries in GLibrary | exception | error | x11, linux, webview, webkitgtk, reflection, native-interop |
| Offscreen framebuffer is not complete | exception | error | opengl, graphics, framebuffer, glcanvaselement, driver |
| Binding to XamlSetMarkupExtensionHandler failed | exception | error | xaml, markup-extension, reflection, attribute-binding |
| GetTSType: The type is not supported (SpecialType: … | exception | error | wasm, typescript, source-generator, emscripten, bindings, type-mapping |
| NotImplemented_GetFormattedString | exception | error | system-json, json, lottie, invariant, uno-platform |
| Program link failed | exception | critical | opengl, silk-net, glsl, shader-link, shader-program |
| Property ' ' is already set to this ' ' object | exception | error | xaml, duplicate-member, xamlwriter, validation |
| Type property must be set before calling ProvideValue method | exception | error | xaml, markup-extension, x-array, invalidoperation, system-xaml |
| ChoosePixelFormat failed | exception | critical | opengl, windows, pixelformat, native-interop, gdi |
| There is already a resource with name | exception | error | xaml, resource-dictionary, duplicate-key, build |
| There is already an object of type | exception | error | xaml, invalid-operation, object-reader, naming, reference-graph, uno-xaml |
| The value for ' ' property is null | exception | error | xaml, null-value, get-object, object-writer |
| instance type ' ' has no default constructor. | exception | error | xaml, object-reader, constructor, type-converter, uno-xaml |
| Flag mode is not supported | exception | error | spellchecking, hunspell, dictionary, notsupported |
| Type is unsupported for indexing. | exception | error | xbind, xaml, parser, source-generator, indexer |
| SetPixelFormat failed | exception | critical | opengl, windows, pixelformat, native-interop, gdi |
| Couldn't read the static field named _libraries in GLibrary | exception | error | x11, linux, webview, webkitgtk, reflection, native-interop |
| The property ' ' of type ' ' does not support adding… | exception | error | xaml, property-assignment, collection, build |
| Local values are not allowed in resource dictionary with… | exception | error | xaml, resource-dictionary, merged-dictionaries, build |
| elements | exception | error | xaml, markup-extension, x-array, argumentnull, system-xaml |
| Item in the array must be an instance of | exception | error | xaml, markup-extension, x-array, type-mismatch, invalidoperation, system-xaml |
| typeArguments array contains one or more null XamlTypeName | exception | error | xaml, schema, argument-null, type-arguments, uno-xaml |
| ValidateProgram failed | exception | error | opengl, silk-net, shader-program, validate-program, shader-state, glsl |
| Vertex shader failed to compile | exception | error | opengl, glsl, shader, skia, graphics, samples |
| serviceProvider does not implement IXamlNameResolver | exception | error | xaml, markup-extension, bind, invalidoperation, iservicelocator, system-xaml |
| ConverterType ' ' is not derived from ' ' type | exception | error | xaml, schema, type-mismatch, value-converter, uno-xaml |
| GL error at end of Init: 0x | exception | error | opengl, silk-net, get-error, diagnostics, gl-state, error-sweep |
| No supported cmap subtable found (Platform 3/Encoding 1 or… | exception | error | font, build-tool, fontfallbackpreprocessor, truetype, cmap |
| GetUniform readback mismatch: got | exception | error | opengl, silk-net, uniform, uniform-array, glsl, driver-quirk |
| Unable to find [MapGrid] template part | exception | error | maps, control-template, template-part, android, uno-platform |
| Value ' ' (of type ) is not of or convertible to type… | exception | error | xaml, type-mismatch, type-conversion, object-writer, format-string-bug |
| Failed to start git process. | exception | critical | git, process, environment, ci, build |
| Member ' ' is already written to current type | exception | error | xaml, duplicate-member, object-writer |
| Unable to find type | exception | error | xaml, type-resolution, x-name, build |
| Cannot cast object ' ' to string | exception | error | xaml, serialization, type-converter, invalid-cast, uno-xaml |
| GetActiveUniform did not report uWave | exception | error | opengl, silk-net, uniform, uniform-array, introspection, driver-quirk, glsl |
| The configuration property must be provided | exception | error | msbuild, source-generator, build-config, configuration, native-ctor |
| Current operation is valid only when the underlying type on… | exception | error | xaml, schema, invoker, type-resolution, reflection |
| serviceProvider | exception | error | xaml, markup-extension, x-reference, argumentnull, system-xaml |
| The staged content was released when the download was… | exception | error | wasm, storage, streams, download, lifecycle, typescript |
| ClientWaitSync failed | exception | error | opengl, silk-net, fence-sync, client-wait-sync, webgl2, context-loss, gpu-reset |
| cmap format not supported (only 4 and 12) | exception | error | font, build-tool, fontfallbackpreprocessor, truetype, cmap |
| Fragment shader failed to compile | exception | error | opengl, glsl, shader, skia, graphics, samples |
| The type ' ' is not found. | exception | error | roslyn, source-generator, type-resolution, routed-events, xaml |
| Expected attached property path to be member access. | exception | error | xbind, xaml, parser, source-generator, attached-property |
| Either of converterType, targetType or name must be non-null | exception | error | xaml, schema, argument, value-converter, uno-xaml |
| Name property is not set | exception | error | xaml, markup-extension, bind, invalidoperation, system-xaml |
| Unable to find StaticLayout constructor. | exception | critical | android, reflection, text-layout, static-layout, java, version-compat |
| Cannot assign child of type | exception | error | xaml, type-mismatch, property-assignment, build |
| Playlist Items could not be set | exception | error | media-player, wasm, playlist, uno-platform |
| Unable to resolve (Reason: , Location: , Candidates: ) | exception | error | roslyn, xaml, type-resolution, ambiguous, source-generator |
| unknownTypeNamespace | validation | error | xaml, argument-null, xamltype |
| XLIB ERROR: Cannot connect to X server | exception | critical | x11, media-player, libvlc, skia, linux, display, uno-platform |
| Program failed to link with error | exception | critical | opengl, silk-net, glsl, shader-link, shader-program |
| GenerateBitmap is not supported by this platform | exception | error | wasm, rendertargetbitmap, platform, bitmap, notsupported, samples |
| instance type ' ' must be public and non-nested. | exception | error | xaml, object-reader, reflection, type-visibility, uno-xaml |
| Could not lookup prefix for namespace | exception | error | xaml, schema, namespace, prefix, serialization, uno-xaml |
| No valid setter found for attached property | exception | error | roslyn, xaml, attached-property, type-resolution, source-generator |
| Cannot resolve runtime namespace from XML namespace | exception | error | xaml, namespace, clr-namespace, schema-context |
| Function returned an unsupported type | exception | error | wasm, interop, mono, typescript, unmarshaled |
| Keyboard lock is not supported by this browser. | exception | warning | wasm, browser, keyboard, feature-detection, typescript |
| Offscreen FBO is not complete | exception | critical | opengl, silk-net, fbo, framebuffer, render-to-texture, gl-es, webgl |
| An error occurred on getting provided value | exception | error | xaml, markup-extension, inner-exception, object-writer |