Создание excel отчетов BPMOnline 5.4

Page.BaseMessagePanel.Clear();
if (string.IsNullOrEmpty(SchemaName)) {
	Page.BaseMessagePanel.AddMessage(WarrningMessage, UnableSelectObjectMessage, MessageType.Warning, true);
	return true;
}
Page.Response.ClearHeaders();
Page.Response.ClearContent();
string fileName = SchemaName;
var instance = UserConnection.EntitySchemaManager.GetInstanceByUId(SchemaId);
if (instance != null) {
	fileName = instance.Caption.ToString();
}
Page.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Page.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
 
List<double> columnWidthsList = new List<double>();
using (MemoryStream stream = new MemoryStream()) {
	using(SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook)) {
		// Add a WorkbookPart to the document.
        var workbookpart = spreadsheetDocument.AddWorkbookPart();
        workbookpart.Workbook = new OpenXmlSpreadsheet.Workbook();
 
        // Add a WorksheetPart to the WorkbookPart.
        var worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
        var workbookStylesPart = workbookpart.AddNewPart<WorkbookStylesPart>(); 
		worksheetPart.Worksheet = new OpenXmlSpreadsheet.Worksheet(new OpenXmlSpreadsheet.SheetData());
 
        // Add Sheets to the Workbook.
        OpenXmlSpreadsheet.Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild<OpenXmlSpreadsheet.Sheets>(new OpenXmlSpreadsheet.Sheets());
 
        // Append a new worksheet and associate it with the workbook.
		string relationshipId = spreadsheetDocument.WorkbookPart.GetIdOfPart(worksheetPart);
		string sheetName = fileName;
        OpenXmlSpreadsheet.Sheet sheet = new OpenXmlSpreadsheet.Sheet() {
			Id = relationshipId,
            SheetId = 1, 
			Name = sheetName
        };
        sheets.Append(sheet);
 
        OpenXmlSpreadsheet.Worksheet worksheet = new OpenXmlSpreadsheet.Worksheet();
        OpenXmlSpreadsheet.SheetData sheetData = new OpenXmlSpreadsheet.SheetData();
        OpenXmlSpreadsheet.Row row = new OpenXmlSpreadsheet.Row();
 
		OpenXmlSpreadsheet.Cell currentCell;
		int columnCount = 0;
		var entitySchema = UserConnection.EntitySchemaManager.GetInstanceByName(SchemaName);
		foreach (var column in entitySchema.Columns) {
			if (!column.DefValue.IsSystemValue && !column.Name.Equals("ProcessListeners")) {
				currentCell = new OpenXmlSpreadsheet.Cell();
				currentCell.DataType =  OpenXmlSpreadsheet.CellValues.String;
				if (column.RequirementType == EntitySchemaColumnRequirementType.ApplicationLevel || column.RequirementType == EntitySchemaColumnRequirementType.DBLevel) {
					currentCell.StyleIndex = 3;
				} else {
					currentCell.StyleIndex = 4;
				}
				columnWidthsList.Add(CalculateWidth(column.Caption.Value));
	            currentCell.CellValue = new OpenXmlSpreadsheet.CellValue(column.Caption.Value);
				row.AppendChild(currentCell);
			}
		}
		sheetData.Append(row);
		row = new OpenXmlSpreadsheet.Row();
		for (int i=0;i<columnWidthsList.Count; i++) {
			currentCell = new OpenXmlSpreadsheet.Cell();
			currentCell.DataType =  OpenXmlSpreadsheet.CellValues.String;
			currentCell.StyleIndex = 5;
			row.AppendChild(currentCell);
		}
		sheetData.Append(row);
		//Adding columns and specifeing width
		OpenXmlSpreadsheet.Columns columns = new OpenXmlSpreadsheet.Columns();
		uint j = 1;
		foreach (var w in columnWidthsList) {
			columns.Append(CreateColumnData(j, w));
			j++;
		}
		worksheet.Append(columns);
		//--
        worksheet.Append(sheetData);
 
		workbookStylesPart.Stylesheet = CreateStyleSheet();
        worksheetPart.Worksheet = worksheet;
		spreadsheetDocument.Close();
 
		stream.Seek(0, SeekOrigin.Begin);
		byte[] dataArray = stream.ToArray();
 
		Page.Response.BinaryWrite(dataArray);
		Page.Response.End();
	}
}
return true;

workbookStylesPart.Stylesheet = CreateStyleSheet();

            Page.Response.ClearHeaders();
            Page.Response.ClearContent();
            Page.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Page.Response.AddHeader("Content-Disposition", "attachment; filename=TurnoverReport.xlsx");
 
            using (DB.DBExecutor dbExecutor = UserConnection.EnsureDBConnection())
            {
                using (MemoryStream stream = new MemoryStream())
                {
                    #region openxml
                    using (OpenXmlPackaging.SpreadsheetDocument spreadsheetDocument = OpenXmlPackaging.SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook, true))
                    {
//...тут все без ошибок
                    }//using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create
                    #endregion
 
                    stream.Seek(0, SeekOrigin.Begin);
                    byte[] dataArray = stream.ToArray();
 
                    Page.Response.BinaryWrite(dataArray);
                    Page.Response.End();
 
                } //using (MemoryStream stream = new MemoryStream())
            } //using dbExecutor

workbookStylesPart.Stylesheet = CreateStyleSheet();

Page.Response