Error:

System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
  at System.ThrowHelper.ThrowKeyNotFoundException()
  at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
  at MySql.Data.MySqlClient.MySqlField.SetFieldEncoding()
  at MySql.Data.MySqlClient.NativeDriver.GetColumnData(MySqlField field)
  at MySql.Data.MySqlClient.NativeDriver.GetColumnsData(MySqlField[] columns)
  at MySql.Data.MySqlClient.Driver.GetColumns(Int32 count)
  at MySql.Data.MySqlClient.ResultSet.LoadColumns(Int32 numCols)
  at MySql.Data.MySqlClient.ResultSet..ctor(Driver d, Int32 statementId, Int32 numCols)
  at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
  at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
  at MySql.Data.MySqlClient.MySqlDataReader.Close()
  at MySql.Data.MySqlClient.MySqlDataReader.Dispose()
  at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
  at MySql.Data.MySqlClient.Driver.Configure(MySqlConnection connection)
  at MySql.Data.MySqlClient.MySqlConnection.Open()
  at System.configkey.GetValue(String key)
  at System.configkey.GetValueBool(String key)
  at System.Default.Page_Load(Object sender, EventArgs e)
  at System.Web.UI.Control.OnLoad(EventArgs e)
  at System.Web.UI.Control.LoadRecursive()
  at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  at System.Web.UI.Page.HandleError(Exception e)
  at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  at System.Web.UI.Page.ProcessRequest()
  at System.Web.UI.Page.ProcessRequest(HttpContext context)
  at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
  at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
  at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)