SSRS Failing with error on App_global.asax

Question

Our SSRS server has started failing. The Logs are currently showing the following error:

System.BadImageFormatException:
    Could not load file or assembly 'file:///C:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\RSTempFiles\reportserver\c2a527bc\9cd1a7f9\App_global.asax.lmmhf4gb.dll' or one of its dependencies.
    This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

It seems like the SSRS service is compiling the web site using .NET 4.0, but it should be using v3.5 from everything we've discovered.

score 1 · Accepted Answer · answered Jun 26 '14 at 06:45

Found the fix here: http://blogs.msdn.com/b/selvar/archive/2012/07/14/reporting-services-unexpectedly-loads-net-framework-4-0-by-default-and-fails-with-http-500-19-while-browsing-report-server-and-report-manager-url.aspx

Turns out that the registry key HKLM\SOFTWARE\Microsoft\.NETFramework\OnlyUseLatestCLR was set to 1. No idea how it got there. Once we changed it, everything worked again.

SSRS Failing with error on App_global.asax

1 Answers1