Cannot Load File or Assembly

Environment

Product	Progress® Telerik® Reporting
Version	Q2 2012 and later
Report Viewers	WinForms, WPF, ASP.NET

Description

When deploying a project with Telerik Reporting on a server, I get the Could not load file or assembly 'Telerik.ReportViewer.WebForms, Version=x.x.x.x, Culture=neutral, PublicKeyToken=a9d7983dfcc261be (or one of its dependencies) error.

Cause

The system cannot find the specified file. During the installation of Telerik Reporting on a developer machine, the Telerik Reporting assemblies are added to GAC. When deploying a project by using the Visual Studio built-in functionality, the assemblies from the GAC are not automatically copied.

Solution

You need to make sure that the assemblies physically exist in the bin folder of your application. For the full details, refer to the Deploying Web Applications article.