this error occur when I run the SSRS report. Here are to solution :
1. on your windows server that contains SQL Server, go to C:\Program Files\Microsoft SQL Server, then do find the MRS for your environment.
2. find rssrvpolicy.config
3. replace PermissionSetName=”Execution” on class=”UnionCodeGroup” with PermissionSetName=”FullTrust”
source : https://msdn.microsoft.com/en-us/library/ms155866.aspx
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