Revit 2026.1 Plugin failed to launch

Speckle Help
1

Thank you for seeking help! Our friendly community is here to assist you. :folded_hands:

To assist you better, please consider providing:

  • Objective: Trying to login to the application but unable to access login interface - Revit 2026.1
  • Issue: Plugin crashes on startup, Blank Page
  • Logs:
    2025-06-12 10:23:56.453 +07:00 [ERR] An unhandled Exception occured
    System.InvalidOperationException: Webview Failed to initialize
    —> System.NotImplementedException: Unable to cast to Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Environment.
    This may happen if you are using an interface not supported by the version of the WebView2 Runtime you are using.
    For instance, if you are using an experimental interface from an older SDK that has been modified or removed in a newer runtime.
    Or, if you are using a public interface from a newer SDK that wasn’t implemented in an older runtime.
    For more information about WebView2 versioning please visit the following: Prerelease and Release SDKs for WebView2 - Microsoft Edge Developer documentation | Microsoft Learn
    —> System.InvalidCastException: Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Environment’. This operation failed because the QueryInterface call on the COM component for the interface with IID ‘{B96D755E-0319-4E92-A296-23436F46A1FC}’ failed due to the following error: No such interface supported (0x80004002 (E_NOINTERFACE)).
    at Microsoft.Web.WebView2.Core.CoreWebView2Environment.get__nativeICoreWebView2Environment()
    — End of inner exception stack trace —
    at Microsoft.Web.WebView2.Core.CoreWebView2Environment.get__nativeICoreWebView2Environment()
    at Microsoft.Web.WebView2.Core.CoreWebView2Environment.CreateCoreWebView2ControllerAsync(IntPtr ParentWindow)
    at Microsoft.Web.WebView2.Wpf.WebView2Base.<>c__DisplayClass32_0.<g__Init|0>d.MoveNext()
    — End of inner exception stack trace —
    at Speckle.Connectors.Revit2026.Plugin.RevitControlWebView.OnInitialized(Object sender, CoreWebView2InitializationCompletedEventArgs e) in //Connectors/Revit/Speckle.Connectors.Revit2026/Plugin/RevitControlWebView.xaml.cs:line 60
    at Speckle.Connectors.Revit2026.Plugin.RevitControlWebView.<>c__DisplayClass2_0.<.ctor>b__1() in /    /Connectors/Revit/Speckle.Connectors.Revit2026/Plugin/RevitControlWebView.xaml.cs:line 25
    at Speckle.Connectors.DUI.Bridge.TopLevelExceptionHandler.<>c__DisplayClass5_0.b__0() in //DUI3/Speckle.Connectors.DUI/Bridge/TopLevelExceptionHandler.cs:line 44
    at Speckle.Connectors.DUI.Bridge.TopLevelExceptionHandler.CatchUnhandled[T](Func`1 function) in /    /DUI3/Speckle.Connectors.DUI/Bridge/TopLevelExceptionHandler.cs:line 61
2

Hi @PrasKaa

We’ve seen this issue before with Revit 2026. It happens on a minority of machines and we suspect it’s to do with WebView2 and some other installation.

Unfortunately, there’s no quick work around this other than examining what other applications are installed to see if WebView2 was involved. We have ideas for a longer term fix but since this seems to be on a minority of machines randomly, we can’t validate a fix.

If you could report what Windows version you have and if there is an Evergreen webview2 installation on it, please post back.

Thanks,
Adam

1 Like
3

Hi Adam,
Here’s the additional info you requested:
Windows Version: Windows 11 24H2
Evergreen webview2 Installed: When I tried to install it manually, the installer says it’s already installed on the PC, but it doesn’t appear in Add/Remove Programs.
Additional Notes:

  • Speckle Connector works fine on Revit 2024 and Revit 2025 on the same machine - this issue is specific to Revit 2026.1