Could not load file or assembly 'Telerik.OpenAccess'

Environment

Product	Progress® Telerik® Reporting
Report Viewer	HTML5 Report Viewers

Error Message

Telerik Reporting Deployment *System.IO.FileNotFoundException: Could not load file or assembly 'Telerik.OpenAccess, Version=2015.1.225.1, Culture=neutral, PublicKeyToken=7ce17eeaf1d59342' or one of its dependencies. The system cannot find the file specified.

Possible Cause

The issue is related to a reference to Telerik.Reporting.Cache.Database.dll or a copy of  Telerik.Reporting.Cache.Database.dll in the Bin folder of the deployed application.

Description

These assemblies are related to the database cache of old viewers, including the obsolete ASP.NET WebForms ReportViewer, but not the Reporting REST service and HTML5 Viewer. The Reporting REST service uses different cache mechanism -REST Service Storage.

Solution

The solution is to remove Telerik.Reporting.Cache.Database.dll reference from the project.

Notes

If you use an old viewer and database cache - Configuring the Database Cache Provider, you may need binding redirects depending on the used Telerik Data Access version.

The used Telerik Data Access version is specified in the dependencies list in each release notes and the corresponding Upgrade Path help article.