Required permissions cannot be acquired.

System.Security.Policy.PolicyException: Required permissions cannot be acquired.

Error: System.Security.Policy.PolicyException: Required permissions cannot be acquired.
Reason:
The Trust level may be Mimimal.
Solution:
1. Go to C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\config
2. Open "Web.Config"
3. Find
4. Replace by
5. Save and Exit
6. Open your Sharepoint Website web.Config.
7. Do the steps 3 & 4.
8. Save and Exit

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