ErrLookup › cefsharp/CefSharp
cefsharp/CefSharp
.NET (WPF and Windows Forms) bindings for the Chromium Embedded Framework · C# · 778 source files
Analyzed at 16bc6e0711 on 2026-08-13. 92 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| BrowserSettings can only be of type | exception | error | cefwsharp, winforms, type-mismatch, browser-settings |
| is required | validation | error | csharp, cefsharp, devtools, serialization, validation, required-field |
| IBrowserHost is null, you've likely call this method before… | exception | error | cefwsharp, winforms, experimental, hwnd, lifecycle |
| To enable synchronous JS bindings set WcfEnabled true in… | exception | error | cefsharp, javascript-binding, wcf, configuration, initialization-order, net-framework |
| Browser has already been created. BrowserSettings must be… | exception | error | cefwsharp, winforms, lifecycle, browser-settings |
| . can no longer be modified, settings must be changed… | exception | error | lifecycle, configuration, immutable, settings, cefsharp |
| browser | validation | error | cefsharp, null-reference, argument-validation, lifecycle |
| Unable to add MessageId | exception | error | csharp, cefsharp, devtools, internal-invariant, concurrency |
| Unable to convert Enum | exception | error | cefsharp, json, enum, serialization, system-text-json |
| UnRegisterResourceHandler can only be used with the default… | exception | error | cefsharp, resource-handler, configuration, extension-method |
| Native access to touch keyboard APIs not supported on this… | exception | error | cefwsharp, wpf, platform, touchkeyboard, windows |
| converter | exception | error | validation, null-reference, datetime, configuration, cefsharp |
| Generated MessageId doesn't match returned Message Id | exception | error | csharp, cefsharp, devtools, internal-invariant, version-mismatch |
| Object already bound with name | exception | error | cefsharp, javascript-binding, duplicate-registration, naming |
| This method can only be called on the CEF UI thread.Use… | exception | error | cefwsharp, winforms, threading, interop |
| A call to WithSharedSettings has already been made, it is… | exception | error | csharp, cefsharp, request-context, builder, fluent, misconfiguration |
| Current OS version is less than Windows 10. Applications… | exception | critical | csharp, cefsharp, windows, manifest, os-version, deployment |
| Registering of .Net framework built in types is not… | exception | error | cefsharp, javascript-binding, type-restriction, winforms, wpf |
| IBrowser instance is no longer valid. Control.Handle was… | exception | error | cefwsharp, winforms, lifecycle, navigation |
| IBrowserHost is null | exception | error | cefwsharp, wpf, screenshot, lifecycle |
| The ChromiumWebBrowser instance creates the underlying… | exception | error | cefsharp, initialization, async, browser-lifecycle, timing |
| Cef.Shutdown has already been called, it's no longer… | exception | critical | lifecycle, shutdown, threading, ui-thread, cefsharp |
| Not currently supported. | exception | error | csharp, cefsharp, devtools, serialization, not-implemented, base64 |
| request | validation | error | csharp, cefsharp, url-request, argument-null, validation |
| Unable to invoke ExecuteDevToolsMethod on CEF UI Thread. | exception | error | csharp, cefsharp, devtools, threading, ui-thread, lifecycle |
| IBrowser | exception | error | csharp, cefsharp, devtools, object-disposed, lifecycle, async |
| urlRequestClient | validation | error | argument-null, url-request, cefscore-core, constructor |
| Could not execute method | exception | error | cefsharp, javascript-binding, method-invocation, wrapped-exception, sync |
| Unable to execute javascript at this time, scripts can only… | exception | error | cefsharp, javascript, v8context, lifecycle |
| Unexpected failure of calling CEF->GetZoomLevelAsync | exception | warning | winforms, zoom, task-continuation, example-code, unobserved-exception |
| now requires an absolute path, the path provided is… | exception | error | cefsharp, configuration, paths, absolute-path, validation |
| Failed to execute dev tools method | exception | error | csharp, cefsharp, devtools, native-call, initialization |
| Method not found on Object of Type | exception | error | cefsharp, javascript-binding, method-not-found, interop-naming, sync |
| Screenshot already in progress, you must wait for the… | exception | error | cefwsharp, wpf, screenshot, concurrency |
| manager | exception | error | cookie-manager, validation, null-reference, constructor, cefsharp |
| Property not found on Object of Type | exception | error | cefsharp, javascript-binding, property-not-found, interop-naming |
| Replace not implemented yet | exception | error | cefwsharp, wpf, example, tabcontrol, notimplemented |
| Unable to Initialize Cef | exception | critical | cef-initialization, dependency, native-binaries, startup |
| Can only be used when CEF is integrated into your WPF… | exception | error | rendering, message-loop, configuration, wpf |
| RequestContext can only be of type | validation | error | cefwsharp, wpf, type-mismatch, request-context |
| RequestContext has already been initialized, | exception | error | request-context, preferences, lifecycle, handler |
| CookieManager store is not initialized. | exception | error | cookie-manager, lifecycle, initialization, race-condition, cefsharp |
| name | exception | error | javascript-binding, validation, null-reference, registration, cefsharp |
| requestContextHandler | validation | error | csharp, cefsharp, request-context, argument-null, validation, handler |
| IBrowser instance is null. Browser has likely not finished… | exception | error | cefsharp, browser, lifecycle, null-reference |
| Nested Exception Invalid | exception | info | example-code, js-binding, nested-exception, intentional |
| invalid or illegal characters used for binding property… | validation | error | cefsharp, javascript-binding, configuration, naming, validation |
| A call to WithCachePath has already been made, it's not… | exception | error | csharp, cefsharp, request-context, builder, fluent, misconfiguration |
| ScreenshotOrNull and ScreenshotAsync can only be used in… | exception | error | offscreen, render-handler, screenshot, type-mismatch |
| Browser has not yet finished initializing or is being… | exception | error | cefwsharp, wpf, screenshot, lifecycle |
| UseAnyCpuAssemblyResolver has already been called, call | exception | error | any-cpu, assembly-resolver, startup, configuration |
| Unable to load byte[] with length 0. | validation | error | resource-handler, validation, empty-data, constructor, cefsharp |
| value | exception | error | javascript-binding, validation, null-reference, registration, cefsharp |
| IFrame instance is null. Browser has likely not finished… | exception | error | cefsharp, frame, lifecycle, initialization |
| IBrowserHost instance is null. Browser has likely not… | exception | error | cefsharp, browser-host, lifecycle, initialization |
| Please provide a valid mimeType | validation | error | cefsharp, resource-handler, legacy, argument-validation, mime |
| Frame is invalid, unable to continue. | exception | error | frame-invalid, download, lifecycle, cefscore-core |
| RequestContext is null, unable to obtain cookie manager | exception | error | cefsharp, cookies, lifecycle, initialization |
| Timeout greater than Maximum allowable value of 4294967295 | validation | error | cefsharp, javascript, argument-validation, timeout |
| Browser has already been created. RequestContext must be… | exception | error | cefwsharp, winforms, lifecycle, request-context |
| Please provide a valid command parameter for binding | exception | error | cefwsharp, wpf, example, commands, validation |
| An instance of the underlying offscreen browser has already… | exception | error | offscreen, browser-created, lifecycle, double-init |
| otherRequestContext | validation | error | csharp, cefsharp, request-context, argument-null, validation |
| This is an exception coming from C# | exception | info | example-code, js-binding, intentional, exception-demo |
| Unable to create FileResourceHandler | exception | error | resource-handler, file-not-found, io, path, cefsharp |
| Browser has been disposed | exception | error | disposal, lifecycle, object-disposed, wpf-hwndhost |
| . must be greater than 0. | validation | error | cefwsharp, screenshot, validation, devtools |
| Cef.Initialize() failed.Check the log file see… | exception | critical | cefsharp, cef-initialization, configuration, native-dependencies, startup |
| Cef.IsInitialized was false!.Check the log file for… | exception | critical | cefsharp, cef-initialization, lifecycle, shutdown, startup |
| other | validation | error | csharp, cefsharp, request-context, builder, argument-null, validation |
| frame | validation | error | argument-null, frame, download, async |
| Unable to locate required Cef/CefSharp dependencies: | exception | critical | native-deps, dependency-check, startup, deployment |
| ChromiumWebBrowser | exception | error | cefsharp, disposal, objectdisposed, lifecycle |
| fieldInfo | validation | error | cefsharp, model-binding, reflection, argument-validation, null-reference |
| Unable to find parent TabPage | exception | error | winforms, tab-control, control-hierarchy, example-code |
| Unable to take screenshot while browser is loading | exception | error | cefwsharp, wpf, screenshot, navigation |
| settings | validation | error | csharp, cefsharp, request-context, argument-null, validation, settings |
| propertyInfo | validation | error | cefsharp, model-binding, reflection, argument-validation, null-reference |
| Expected Exception | exception | info | example-code, js-binding, async, intentional, exception-demo |
| Timeout greater than Maximum allowable value of | validation | error | argument-out-of-range, timeout, evaluate-script |
| Nested Exception Canceled | exception | info | example-code, js-binding, nested-exception, intentional |
| NotFound | exception | critical | native-deps, libcef, startup, file-not-found |
| Invalid size, must be greater than 0,0 | validation | error | wpf, browser-creation, size, validation |
| Unable to load for arch | exception | critical | any-cpu, native-deps, architecture, startup, file-not-found |
| An IFrame instance is required. | validation | error | argument-null, frame, scripted-methods, example-code |
| viewPort.Scale must be greater than 0. | validation | error | screenshot, viewport, validation, wpf-hwndhost |
| maxDegreeOfParallelism | exception | error | cefsharp, task-scheduler, argument-validation, concurrency |
| Argument less than 10. | validation | error | message-loop, timer, validation, wpf-hwndhost |
| CookieManager | exception | error | cookies, disposal, async, object-disposed |
| RenderHandler cannot be null. Use DefaultRenderHandler… | exception | error | offscreen, render-handler, screenshot, null-reference |
| Please provide a valid filePath | exception | error | resource-handler, validation, null-reference, constructor, cefsharp |
| Please provide a valid array | validation | error | resource-handler, validation, null-reference, constructor, cefsharp |