System.IO.FileNotFoundException: The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
   at Microsoft.SharePoint.Library.SPRequestInternalClass.GetFileAsByteArray(String bstrUrl, String bstrWebRelativeUrl, Boolean bHonorLevel, Byte iLevel, OpenBinaryFlags grfob)
   at Microsoft.SharePoint.Library.SPRequest.GetFileAsByteArray(String bstrUrl, String bstrWebRelativeUrl, Boolean bHonorLevel, Byte iLevel, OpenBinaryFlags grfob)
   at Microsoft.SharePoint.SPFile.GetFileContent(SPOpenBinaryOptions openOptions)
   at Microsoft.SharePoint.SPFile.OpenBinary(SPOpenBinaryOptions openOptions)
   at Microsoft.SharePoint.SPFile.OpenBinary()
   at ePub_DownloadFile.<>c__DisplayClass3.<DLSPFile>b__0() in c:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\GCAA\ePublication\DownloadFile.aspx.cs:line 63
   at Microsoft.SharePoint.SPSecurity.CodeToRunElevatedWrapper(Object state)
   at Microsoft.SharePoint.SPSecurity.<>c__DisplayClass4.<RunWithElevatedPrivileges>b__2()
   at Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode)
   at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(WaitCallback secureCode, Object param)
   at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(CodeToRunElevated secureCode)
   at ePub_DownloadFile.DLSPFile(String sURL) in c:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\GCAA\ePublication\DownloadFile.aspx.cs:line 43