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Dealing with FileNotFoundException - Could not Load File or Assembly System.IO.Hashing
Updated on Mar 19, 2026
Environment
| Version | Product | Author |
|---|---|---|
| 2026.1.304 | RadPdfProcessing | Desislava Yordanova |
| .NET 8 (or newer) Target OS: Windows | Target Framework | - |
Description
When exporting a PDF document using the PdfFormatProvider, the following error occurs:
System.IO.FileNotFoundException: 'Could not load file or assembly 'System.IO.Hashing'.
Solution
The Telerik.Windows.Documents.Fixed NuGet package has a dependency to the System.IO.Hashing introduced in version 2026.1.304.
In case your project throws the exception at runtime, install the System.IO.Hashing NuGet package manually.