How to call functions of c++ dll in c# web service / library

I am using com library of c++ dll in c#.
Here is my c++ function which is in DLL.

STDMETHODIMP StdObj::Operation(VARIANT* Param1, VARIANT* Param2, LONG* Param3)
{
//Implementation code…..
}

Here is my code which is written in c#

Using LibraryLib;
using System.Runtime.InteropServices;
class Program
    {
      

       
        static void Main(string[] args)
        {
            List<String> First = new List<String>(3);
            First.Add("10/7/2014");
            First.Add("29/6/2015");
            First.Add("10/8/2016");
            
            List<Double> Second = new List<Double>(3);
            Second.Add(-10000);
            Second.Add(25000);
            Second.Add(50000);
            
            int Third;
             LibraryLib.TestObj _Obj1 = new LibraryLib.TestObj();
             _Obj1.BusinessObject(First.ToArray(), Second.ToArray(), out Third);
        }
    }
}  

While running code I am getting this error
Additional information: Memory is locked. (Exception from HRESULT: 0x8002000D (DISP_E_ARRAYISLOCKED))