New Post: Error on 64bit System : "The type initializer for 'NPOI.OpenXmlFormats.Spreadsheet.ThemeDocument' threw an exception.

I have got the following error on 64 bits machine but it is working on 32 bits at line -:

 var templateWorkbook = new XSSFWorkbook(uploadedFile.InputStream);

"The type initializer for 'NPOI.OpenXmlFormats.Spreadsheet.ThemeDocument' threw an exception.