New Post: CopyTo one to another workbook style error

mscorlib.dll!System.Collections.Generic.Dictionary<int,System.__Canon>.this[int].get(int key) + 0x8a 

ClosedXML.dll!ClosedXML.Excel.XLWorkbook.GetStyleById(int id)

System.Core.dll!System.Linq.Enumerable.WhereSelectEnumerableIterator<int,System.__Canon>.MoveNext() + 0xc8
ClosedXML.dll!ClosedXML.Excel.XLWorkbook.GenerateWorkbookStylesPartContent(DocumentFormat.OpenXml.Packaging.WorkbookStylesPart workbookStylesPart, ClosedXML.Excel.XLWorkbook.SaveContext context) 行 2443 + 0x8ae 
ClosedXML.dll!ClosedXML.Excel.XLWorkbook.CreateParts(DocumentFormat.OpenXml.Packaging.SpreadsheetDocument document) 行 139 + 0x1a
ClosedXML.dll!ClosedXML.Excel.XLWorkbook.CreatePackage(string filePath, DocumentFormat.OpenXml.SpreadsheetDocumentType spreadsheetDocumentType)  + 0x10
ClosedXML.dll!ClosedXML.Excel.XLWorkbook.SaveAs(string file) + 0x36 

    {
        return _stylesById[id];
    }