Assembly not loading after downloading package using NuGet

Assembly not loading after downloading package using NuGet

I created a new web project. Added EPPlus library using NuGet package &
then added below code from codeplex EPPlus page.
FileInfo newFile = new FileInfo(@"c:\sample1.xlsx");
if (newFile.Exists)
{
newFile.Delete(); // ensures we create a new workbook
newFile = new FileInfo(@"c:\sample1.xlsx");
}
using (ExcelPackage package = new ExcelPackage(newFile))
{
// add a new worksheet to the empty workbook
ExcelWorksheet worksheet =
package.Workbook.Worksheets.Add("Inventory");
//Add the headers
worksheet.Cells[1, 1].Value = "ID";
worksheet.Cells[1, 2].Value = "Product";
worksheet.Cells[1, 3].Value = "Quantity";
worksheet.Cells[1, 4].Value = "Price";
worksheet.Cells[1, 5].Value = "Value";
//Add some items...
worksheet.Cells["A2"].Value = 12001;
worksheet.Cells["B2"].Value = "Nails";
worksheet.Cells["C2"].Value = 37;
worksheet.Cells["D2"].Value = 3.99;
worksheet.Cells["A3"].Value = 12002;
worksheet.Cells["B3"].Value = "Hammer";
worksheet.Cells["C3"].Value = 5;
worksheet.Cells["D3"].Value = 12.10;
worksheet.Cells["A4"].Value = 12003;
worksheet.Cells["B4"].Value = "Saw";
worksheet.Cells["C4"].Value = 12;
worksheet.Cells["D4"].Value = 15.37;
//Add a formula for the value-column
worksheet.Cells["E2:E4"].Formula = "C2*D2";
//Ok now format the values;
using (var range = worksheet.Cells[1, 1, 1, 5])
{
range.Style.Font.Bold = true;
range.Style.Fill.PatternType = ExcelFillStyle.Solid;
range.Style.Fill.BackgroundColor.SetColor(Color.DarkBlue);
range.Style.Font.Color.SetColor(Color.White);
}
worksheet.Cells["A5:E5"].Style.Border.Top.Style =
ExcelBorderStyle.Thin;
worksheet.Cells["A5:E5"].Style.Font.Bold = true;
worksheet.Cells[5, 3, 5, 5].Formula =
string.Format("SUBTOTAL(9,{0})", new ExcelAddress(2, 3, 4,
3).Address);
worksheet.Cells["C2:C5"].Style.Numberformat.Format = "#,##0";
worksheet.Cells["D2:E5"].Style.Numberformat.Format = "#,##0.00";
//Create an autofilter for the range
worksheet.Cells["A1:E4"].AutoFilter = true;
worksheet.Cells["A2:A4"].Style.Numberformat.Format = "@";
//Format as text
worksheet.Cells.AutoFitColumns(0); //Autofit columns for all cells
// lets set the header text
worksheet.HeaderFooter.OddHeader.CenteredText =
"&24&U&\"Arial,Regular Bold\" Inventory";
// add the page number to the footer plus the total number of pages
worksheet.HeaderFooter.OddFooter.RightAlignedText =
string.Format("Page {0} of {1}", ExcelHeaderFooter.PageNumber,
ExcelHeaderFooter.NumberOfPages);
// add the sheet name to the footer
worksheet.HeaderFooter.OddFooter.CenteredText =
ExcelHeaderFooter.SheetName;
// add the file path to the footer
worksheet.HeaderFooter.OddFooter.LeftAlignedText =
ExcelHeaderFooter.FilePath + ExcelHeaderFooter.FileName;
worksheet.PrinterSettings.RepeatRows = worksheet.Cells["1:2"];
worksheet.PrinterSettings.RepeatColumns = worksheet.Cells["A:G"];
// Change the sheet view to show it in page layout mode
worksheet.View.PageLayoutView = true;
// set some document properties
package.Workbook.Properties.Title = "Invertory";
package.Workbook.Properties.Author = "Jan Källman";
package.Workbook.Properties.Comments = "This sample demonstrates
how to create an Excel 2007 workbook using EPPlus";
// set some extended property values
package.Workbook.Properties.Company = "AdventureWorks Inc.";
// set some custom property values
package.Workbook.Properties.SetCustomPropertyValue("Checked by",
"Jan Källman");
package.Workbook.Properties.SetCustomPropertyValue("AssemblyName",
"EPPlus");
// save our new workbook and we are done!
package.Save();
}
Problem: After executing this code I get following error:
Could not load file or assembly 'EPPlus, Version=3.0.0.2, Culture=neutral,
PublicKeyToken=ea159fdaa78159a1' or one of its dependencies. The located
assembly's manifest definition does not match the assembly reference.
(Exception from HRESULT: 0x80131040)
I am not sure,What should I do ?? Please help.
Thank you