Server Error in '/' Application.

Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.]
   System.Data.DataTable.EnableConstraints() +500
   System.Data.DataTable.set_EnforceConstraints(Boolean value) +40
   System.Data.DataTable.EndLoadData() +215
   System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue) +242
   System.Data.Common.DataAdapter.Fill(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords) +359
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +169
   System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +157
   System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +106
   Portal23.DataSet1TableAdapters.GetNationalOfficerContactInfoTableAdapter.GetNationalContactInfo() in C:\Users\shiel\source\repos\Portal23\DataSet1.Designer.cs:66231
   Portal23.Contact.Page_Load(Object sender, EventArgs e) in C:\Users\shiel\source\repos\Portal23\Contact.aspx.cs:13
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +85
   System.Web.UI.Control.OnLoad(EventArgs e) +79
   System.Web.UI.Control.LoadRecursive() +130
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2852


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0