SSRS Deployment Failed - The "DeployToReportsServerTask" task failed unexpectedly

Error # 1:

The "DeployToReportsServerTask" task failed unexpectedly.
System.IO.FileLoadException: Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401)
   at Microsoft.Dynamics.Framework.Deployment.Reports.DeployToReportsServerTask.Deploy(IEnumerable`1 transitiveReferenceClosure, DeploymentLogger logger, Boolean restartReportServer)
   at Microsoft.Dynamics.Framework.Deployment.Reports.DomainBoundHelper.Deploy(IEnumerable`1 transitiveReferenceClosure, DeploymentLogger logger, Boolean restartReportServer)
   at Microsoft.Dynamics.Framework.Deployment.Reports.DomainBoundHelper.Deploy(IEnumerable`1 transitiveReferenceClosure, DeploymentLogger logger, Boolean restartReportServer)
   at Microsoft.Dynamics.Framework.Deployment.Reports.DeployToReportsServerTask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__20.MoveNext() C:\Program Files (x86)\MSBuild\Microsoft\DynamicsTools\Microsoft.Dynamics.Framework.Design.Reporting.Modeling.targets 466 6 VendorDetailsReport

Error # 2: An error occurred : Access is denied.

If User Account Control (UAC) is enabled on the machine, close the application, right-click the application, and then click Run as administrator. C:\Program Files (x86)\MSBuild\Microsoft\DynamicsTools\Microsoft.Dynamics.Framework.Design.Reporting.Modeling.targets 466 6 VendorDetailsReport

Error # 3: The deployment was aborted. You do not have privileges to deploy to server: SINGU-VIRTUAL. For deployment, you must have administrative rights to the SQL Server Reporting Services (SSRS) server. Contact your administrator to deploy. C:\Program Files (x86)\MSBuild\Microsoft\DynamicsTools\Microsoft.Dynamics.Framework.Design.Reporting.Modeling.targets 466 6 VendorDetailsReport

Solution:

Open Visual Studio with "Run As Administrator" and open the project. Try to re-deploy the solution again