unable to update the first cell in the excel works

问题:

the following code was used in a execute script task of ssis package based on c# 2017 language used the following code which was taken from this answer

Application excelApplication = new Excel.Application
            {
                Visible = true,
                ScreenUpdating = true
            };
            string filename;//= Dts.Variables["User::filename"].Value.ToString();
            filename = @"D:\Sundeep\2019\01082019\VersionWithDummyData\finbalReviewTest.xlsx";
            _Workbook workbook = excelApplication.Workbooks.Open(filename);
            _Worksheet sheet = workbook.Worksheets[1];
            Dts.TaskResult = (int)ScriptResults.Success;

When i try to execute the logic I'm getting the following error

Error at updating the first cell: The binary code for the script is not found. Please open the script in the designer by clicking Edit Script button and make sure it builds successfully.
Error at updating the first cell: There were errors during task validation.

My requirement was to update the first cell(A1) in a sheet(sheet name:test_update) of excel with "hello world!"

Thanks in advance