Symbols for the module 'EPPlus.dll' were not loaded. No Worksheets visible in Excel 2013

Aug 17, 2016 at 12:40 PM
I build web application with this code:
ExcelPackage EP = new ExcelPackage();
            ExcelWorkbook EW = EP.Workbook;
            ExcelWorksheet wsUsers = EW.Worksheets.Add( "Users" );
            ExcelWorksheet wsGroups = EW.Worksheets.Add( "Groups" );
            ExcelWorksheet wsRelation = EW.Worksheets.Add( "Relation" );

            wsUsers.Cells[ 1, 1 ].Value = "ID USER";
            wsUsers.Cells[ 1, 2 ].Value = "FIRST NAME";
            wsUsers.Cells[ 1, 3 ].Value = "LAST NAME";

            wsUsers.View.FreezePanes( 2, 1 );

            ExcelRange ER = wsUsers.Cells[ "A1:C1" ];
            ER.Style.Font.Name = "Arial";
            ER.Style.Font.Size = 20;
            ER.Style.Font.Bold = true;

            Response.BinaryWrite( EP.GetAsByteArray() );
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.AddHeader( "content-disposition", "attachment;  filename=ExcelDemo.xlsx" );
After start web application, visual studio 2013 says: "Symbols for the module 'EPPlus.dll' were not loaded." ... Web application started. After click on button, code will create excel file.
But after open it - no worksheets visible in Excel 2013 (no errors, no worksheets).
In Excel 2007 says:
Program Excel found unreadable content in 'ExcelDemo.xlsx'. Do you want to repair ? ...
After repair it - i will see what i was expected.
Aug 18, 2016 at 2:49 PM
Edited Aug 18, 2016 at 2:50 PM
o I am using .net Microsoft.Reporting.WinForms.LocalReport to render Stream of bytes of an xlsx file with Image Charts (designed with SSRS)
``` I am then converting to an ExcelPackage: http://www.talktalkwebmail.org/2016/08/talktalk-webmail-talktalk-mail-login-signup.html