Sql server 2008 R2 report service. Hotfix was installed and form authentication from example was installed. Logon was successfull. When access existing report (was created in default authentication) and try to create new report using Report Builder, got below errors: An error occurred during rendering of the report. (rrRenderingError) Could not load file or assembly 'Microsoft.ReportingServices.ProcessingObjectModel, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. Access is denied. I have assigned permission for ProcessingObjectModel.dll with everyone and anonymous logon. I still got same error. any clue and thanks for help Gary