Could Not Load File or Assembly Error in WPF Demos Application

Updated on Jul 8, 2026

Environment

Product

UI for WPF

Description

When running an example from the Telerik UI for WPF Demos application, you may receive an error similar to:

Could not load file or assembly '...'. The system cannot find the file specified.

This is usually caused by cached ClickOnce files from a previous demos installation.

Solution

1. Close the Telerik UI for WPF Demos application.

2. Uninstall the existing demos application.

3. Clear any cached ClickOnce files by deleting the contents of C:\Users\<your_user>\AppData\Local\Apps\2.0.

   Deleting the contents of this folder removes cache for all ClickOnce applications installed for the current user.

4. Install the latest demos package again from https://demos.telerik.com/wpf/.

5. Run the example again.

See Also

• Installing WPF Demos Application
• SDK Samples Browser Cannot Be Installed or Crashes