The type initializer for 'spr840' threw an exception in C#

Question

Hi The type initializer for 'spr840' threw an exception in below-mentioned line.Anyone please help me Spire.Xls.Workbook workbook = new Spire.Xls.Workbook();

Leon D · Answer

I just ran the following code but it worked well on my side. Workbook workbook = new Workbook(); workbook.LoadFromFile( Input.xlsx ); Worksheet sheet = workbook.Worksheets[0]; //Find all Phone CellRange[] ranges = sheet.FindAllString( Phone  false  false ); foreach (CellRange range in ranges) { //Do things you want } workbook.SaveToFile( Output.xlsx  ExcelVersion.Version2013); I supose you only add the spire.xls.dll please remove it and then reference all the dlls: Spire.Common.dll Spire.License.dll Spire.Pdf.dll Spire.XLS.dll from the bin folder into your project and try again. Or you can use the following command in the NuGet Package Manager Console and press enter it will automatically adds all of the above dlls. Install-Package FreeSpire.XLS -Version 7.9.1 If it still does not work let me know.