[Solved] HTML5Interactive rendering format is not available - WebReportDesigner

[Daniel]

Hi everyone,

I’m currently integrating the Telerik Web Report Designer into an ASP.NET Core application and ran into an issue when trying to preview reports.

Setup:

• Telerik Reporting Version: 2025 Q1
• .NET Version: .NET 8
• Integration method: manual DLL references (no NuGet packages)
• Hosting: ASP.NET Core (Kestrel)

Problem:
The Web Report Designer itself loads correctly. I am able to browse reports, open .trdp files and modify them without any issues. However, when I try to preview a report, I consistently get the following error:

“HTML5Interactive rendering format is not available.”

Any ideas?

[Ivet]

Hi Daniel,

Thank you for reaching out.

When loading Telerik Reporting in a .NET application via assembly references rather than using the dedicated NuGet packages, the dependencies of the Reporting assemblies must be manually installed.

You may have a look at the Requirements section of the Using Telerik Reporting with .NET 6+ or Standard - Telerik Reporting for a list of which packages/assemblies must be manually installed on the project when using Reporting DLL references.

The "HTML5Interactive rendering format is not available" error occurs because you are most likely missing the Telerik.Drawing.Skia assembly (and its native SkiaSharp dependencies) in your manual DLL references.

Telerik Reporting uses SkiaSharp for rendering via Telerik.Drawing.Skia.dll. Without this assembly, the reporting engine has no graphics backend and cannot produce HTML5Interactive output.

Since you're not using NuGet (which would pull these automatically), you also need to ensure the SkiaSharp native runtime is available. The simplest approach is to add the SkiaSharp NuGet package to your project.

Is there a specific reason for needing to use DLL references instead of the NuGet packages? Using NuGet is the recommended approach when working with .NET application since it guarantees that all package dependencies will be installed.

I hope that the provided information will help. Please let me know if you need further assistance.

Regards,
Ivet
Progress Telerik