Creating Enterprise project type in CSOM

I want to create a new EPT (project server 2013) using C# CSOM library. Here is what i have done so far

List<ProjectDetailPageCreationInformation> pages = new List<ProjectDetailPageCreationInformation>();

        projContext.Load(projContext.ProjectDetailPages);
        projContext.ExecuteQuery();

        projContext.Load(projContext.EnterpriseProjectTypes);
        projContext.ExecuteQuery();

        pages.Add(new ProjectDetailPageCreationInformation() { Id = projContext.ProjectDetailPages[12].Id, IsCreate = false });


CreateEPT("New EPT ", "test desc", "PROJECTSITE#0", pages);

private static void CreateEPT(string strName, string strDescription, string strTemplateName, List<ProjectDetailPageCreationInformation> pages)
    {
        EnterpriseProjectTypeCreationInformation newProjType = new EnterpriseProjectTypeCreationInformation();
        newProjType.Description = strDescription;
        newProjType.Id = Guid.NewGuid();
        newProjType.IsDefault = false;

        newProjType.Name = strName;
        newProjType.ProjectDetailPages = pages;

        newProjType.ProjectPlanTemplateId = Guid.Empty;
        newProjType.WorkflowAssociationId = Guid.Empty;
        newProjType.WorkspaceTemplateName = strTemplateName;
        newProjType.Order = 1;

        projContext.EnterpriseProjectTypes.Add(newProjType);
        projContext.EnterpriseProjectTypes.Update();

}

Getting "EnterpriseProjectTypeCreatePDPIsRequired" error. Any idea how to resolve this? or have you created EPT for office 365 project server using CSOM .