Worksheets.copy(before:,After:) error c#

Hello everyone and I'm working on a project that is giving me some trouble. I will show you the code first then explain.

xl.Application xlApp = (xl.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

        xl.Worksheet ws = Globals.ThisWorkbook.Sheets["Sheet2"];
        xl.Workbook newWorkBook = null;
        newWorkBook = xlApp.Workbooks.Add();
        ws.Copy(Before: newWorkBook.Sheets["Sheet1"],After:Type.Missing);

The error that I receive is as follows:

An exception of type 'System.Runtime.InteropServices.COMException' occurred in System.Dynamic.dll but was not handled in user code

Additional Information: Unable to get the copy property of the worksheet class

But when I just run code like

ws.copy();

It runs just fine, switching to a new workbook. I would use this as that is what I'm wanting to do, I just would like to be able to copy 10 worksheets to a new workbook that is the reason that I'm creating a new workbook. Any Ideas?