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Cannot Connect WPF/WinForms Viewer to Report Server/REST Service


Product Progress® Telerik® Reporting
Project Type WPF and WinForms applications
Viewer WPF/WinForms Report Viewer


On attempt to connect WPF or WinForms ReportViewer to an engine of remote type, i.e. Report Server or REST Service, the following error occurs:

The assembly Telerik.Reporting.Services.HttpClient.dll cannot be loaded.


The Telerik.Reporting.Services.HttpClient.dll is required if the selected engine is of remote type (REST Service or Report Server). Please make sure that you have added a reference to this assembly to the current project.

It could be found in Telerik Reporting installation directory. For example C:\Program Files (x86)\Progress\Telerik Reporting 2024 Q2\Bin\Telerik.Reporting.Services.HttpClient.dll.

As a side note, we strongly suggest using the Telerik Report Viewer Window Item Template to create a window and host the report viewer in it. It will automatically add all required references and verify if all resources needed are added to the project.

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