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After combining workbooks using Workbook.Combine() Workbook.Save failed in .NET

`` - in reply to this thread. I am afraid I can not send you any further details regarding the application. I can give you the following details about the objects in the snippet. fileList is a list of strings. WorksheetNames is a list of strings as well. _pitchSharedLocation and _finalDocumentName are strings. Thank you,Aman

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Well, I did test your scenario/case a bit using the following sample code with my template files (attached), it works fine and I do not find any exception. I am using Aspose.Cells for .NET v17.6 (latest version):
Sample code:

      var FinalDocument = new Workbook();
        for (int i = 0; i < FinalDocument.Worksheets.Count; i++)
         List<string> paths = new List<string> { @"e:\test2\1s.xlsx", @"e:\test2\2ss.xlsx", @"e:\test2\3s.xlsx" };
        foreach (var excelPath in paths)
            if (excelPath != null && File.Exists(excelPath))
                Workbook wb = new Workbook(excelPath);    
        List<string> notNeeded = new List<string>();
       foreach (string name in notNeeded)

I have attached the template files and output file for your reference:
files.zip (27.6 KB)

We have no clue why you are gettting this error. Please try our latest version/fix. If you still find the issue, I am afraid, we cannot figure your issue out unless you share your source files, sample application, etc. to reproduce it on our end first.

Thank you.