"Column out of Range" Error when populating an Excel Sheet

I just started implementing this to populate an Excel sheet with some data:

using OfficeOpenXml;

//..
ExcelWorksheet VerificationSheet_Sheet4 = package.Workbook.Worksheets.Add("SheetTitleHere");
int row = 0, col = 0;
VerificationSheet_Sheet4.Cells[row + 1, col].Value = "AnyStringHere"; // error here

However it pops an error saying column is out of range. Why and how can I fix that?