SSRS Deployment Failed - The "DeployToReportsServerTask" task failed unexpectedly

Error

The "DeployToReportsServerTask" task failed unexpectedly.

System.IO.FileLoadException: Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401)

Symptoms: You get the error when trying to deploy a report either by using VS2013 reporting tool or through AOT

Resolution:

1. Go to Control Panel\System and Security\System

2. Open Advanced system settings and open Environment Variables

3. Create a New Variable

4.Variable name: COMPLUS_LoaderOptimization ; Variable value: 1

5. Click OK

6. Logout from the server and logon again.

7. Open the report using Visual Studio 2013 and deploy the AX report.

8. The report can also be deployed from AOT

@Rahul