After Upgrading successfully by transferring upgrade zip file and completing upgrade wizard process after host login, Error HTTP 503 came up when I clicked on "Visit Website" button. After going through Log files below error log was found
DotNetNuke.Services.Exceptions.Exceptions - System.IndexOutOfRangeException: TermsTabId
at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
at System.Data.SqlClient.SqlDataReader.get_Item(String name)
at DotNetNuke.Entities.Portals.PortalInfo.Fill(IDataReader dr)
at DotNetNuke.Common.Utilities.CBO.FillObjectFromReader(Object objObject, IDataReader dr)
Issue happened at Live site