How can i add project outputs using DTE.ExecuteCommand()?

I would like to execute this commands to include project outputs.

My current code is this:

EnvDTE.DTE dte = Marshal.GetActiveObject("VisualStudio.DTE.14.0") as EnvDTE.DTE;
dte.ExecuteCommand("Project.AddProjectOutputs", "Rumo.GeneratorSetup, Primary output, Localized       resources");

But this is generating an exeception:

An exception of type ‘System.Runtime.InteropServices.COMException’ occurred in Rumo.GeneratorSetup.dll but was not handled in user code

Additional information: Command “Project.AddProjectOutputs” is not available.

What can I do to fix this problem?

Thanks.