Server Error in '/' Application.

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Line 140:            imgImageUrl.Visible = entity.ShowImageUrl;
Line 141:            if (entity.Author.isNOE())
Line 142:                litPublishedDate.Text = (entity.HashAlarm) ? string.Format("<i class='fa fa-clock-o' aria-hidden='true'></i> {0:dddd, dd/MM/yyyy} {0:t}", entity.PublishedAlarm.Value) : string.Format("<i class='fa fa-clock-o' aria-hidden='true'></i> {0:dddd, dd/MM/yyyy} {0:t}", entity.PublishedDate.Value);
Line 143:            else
Line 144:                litPublishedDate.Text = (entity.HashAlarm) ? string.Format("<span class='author'>{0}</span> - <i class='fa fa-clock-o' aria-hidden='true'></i> {1:dddd, dd/MM/yyyy} {1:t}", entity.Author, entity.PublishedAlarm.Value) : string.Format("<span class='author'>{0}</span> - <i class='fa fa-clock-o' aria-hidden='true'></i> {1:dddd, dd/MM/yyyy} {1:t}", entity.Author, entity.PublishedDate.Value);

[InvalidOperationException: Nullable object must have a value.]
   System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
   System.Nullable`1.get_Value() +23
   vietnet24h.WebUI.Views_FontEnd_News_View.OnBindData(News entity) in c:\Hosting\vietnet24h.vn\Views\FontEnd\News\View.ascx.cs:142
   Xrow.Web.UI.ViewXPart`1.BindData() +502
   Xrow.Web.UI.ViewXPart`1.OnXLoad() +128
   Xrow.Web.UI.XPart.XPart_Load(Object sender, EventArgs e) +759
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785