Thursday, 31 May 2012

Failed to load expression host assembly. Details: Could not load file or assembly 'Microsoft.EnterpriseManagement.Reporting.Code, or one of its dependencies. Failed to grant minimum permission requests.(rsErrorLoadingExprHostAssembly)

Got this error in SSRS reports containg SCSM 2012 reports performed the following steps and it resolved the issue for me.

Logon to the SSRS server

1)       Copy the Microsoft.EnterpriseManagement.Reporting.Code.dll file from the prerequisite folder of SCSM 2012 Installation media and place it in a folder
2)      Drag and Drop Microsoft.EnterpriseManagement.Reporting.Code.dll  here

C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\ReportServer\Bin.

3)        Add a code segment to the Rssrvpolicy.config file
4)      Navigate to C:\Program Files\Microsoft SQL Server\MSRS10.MSSQLSERVER\Reporting Services\ReportServer.
5)      Open the Rssrvpolicy.config file.
6)      Scroll through the Rssrvpolicy.config file and locate the CodeGroup code segments. The following code shows an example of a CodeGroup segment.

7)      Add the following CodeGroup segment to the same section as the other CodeGroup segments in the Rssrvpolicy.config file.
   Name="Microsoft System Center Service Manager Reporting Code Assembly"
   Description="Grants the SCSM Reporting Code assembly full trust permission.">
8)      Close and save the changes.
9)      Stop and Start SSRS Service


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