SSRS Error: Could not load file or assembly or one of its dependencies. Failed to grant permission to execute.

Issue:

Getting the following error when try to upload a RDL file to SSRS that uses a custom DDL file…

Could not load file or assembly or one of its dependencies. Failed to grant permission to execute.

Fix:

Make sure the DDL file is place in this folder and has the following property set…

D:\Program Files\Microsoft SQL Server Reporting Services\SSRS\ReportServer\bin

File -> Properties -> General -> Unblock checked

Checked the “Unblock” in file permission, restart SSRS services, and try uploading the RDL file again.

https://forums.ivanti.com/s/article/Error-when-attempting-to-preview-a-report-in-BIDS-Failed-to-grant-permission-to-execute-Exception-from-HRESULT-0x80131418?language=en_US