Concatenate Array of PDF Files Using File Paths not working

Question

I was following the Guide on "How to concatenate array of pdf using file path" on this page But with no luck. example: Using the code

using Aspose.Pdf.Facades;
    string[] filesArray = new string[2];
        filesArray[0] = @"D:\MergedPDF\Ball_007811263X\baL1263x_ch01_001-029.pdf";
        filesArray[1] = @"D:\MergedPDF\Ball_007811263X\baL1263x_ch02_030-061.pdf";
        // create PdfFileEditor object
        PdfFileEditor pdfEditor = new PdfFileEditor();
        // display the resultant concatenated PDF file in 
        pdfEditor.Concatenate(filesArray, "outputfoe.pdf");

but it give me an error on the pdfEditor part of pdfEditor.Concatenate(filesArray, "outputfoe.pdf");

The error says: 
Error   1   The type 'System.Web.HttpResponse' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.  C:\Users\rsubedi\Documents\Visual Studio 2012\Projects\MergePDFManual\MergePDFManual\Program.cs 26  13  MergePDFManual

Answer 1

It's trying to open the web browser to display the new PDF. Try adding the assembly System.Web and see what happens