ProSolution Web Enrolments - Application Error

An unexpected application error has occured.

Error Message:

Value cannot be null.
Parameter name: ColumnToAdd

Type of Error:

System.ArgumentNullException

Referring Page:

/PSWebEnrolment/webenrolment.aspx?SubjectArea=Travel+&page=~%2Fwebcontrols%2Fsearch.ascx

Error Location:

   at CompassCC.CCCSystem.CCCCommon.CCCCheck.CheckCondition(Boolean Condition, Exception ExceptionToThrow, String ConditionDescriptionWithFormat, Object[] ConditionFormatArgs)
   at CompassCC.CCCSystem.CCCCommon.CCCCheck.CheckNotNothing(Object ObjectRef, String ObjectName)
   at CompassCC.CCCSystem.CCCCommon.CCC_DataView_ColumnDataTable.EnsureColumnIsSelected(Boolean MakeColumnVisible, Boolean MakeColumnEditable, ICCCAvailableColumn ColumnToAdd, Nullable`1 ColumnTotalAggregateFunction)
   at CompassCC.CCCSystem.CCCCommon.CCC_DataView_ColumnDataTable.EnsureColumnIsSelected(Boolean MakeColumnVisible, Boolean MakeColumnEditable, String ColumnNameToAdd, Nullable`1 ColumnTotalAggregateFunction)
   at CompassCC.CCCSystem.CCCCommon.CCC_DataView_ColumnDataTable.EnsureColumnIsSelected(Boolean MakeColumnVisible, Boolean MakeColumnEditable, DataColumn DataColumnToAdd, Nullable`1 ColumnTotalAggregateFunction)
   at CompassCC.CCCSystem.CCCCommon.CCC_DataView_ColumnDataTable.EnsureColumnsAreSelected(Boolean MakeColumnsVisible, Boolean MakeColumnsEditable, DataColumn[] DataColumnsToAdd)
   at CustomControl.CourseSearchPanel_ListView.LoadGridDataWithSearch() in C:\CompassCC\PS Web Enrolment\App_Code\CourseSearchPanel_ListView.vb:line 1081
   at CustomControl.CourseSearchPanel_ListView.LoadGridData() in C:\CompassCC\PS Web Enrolment\App_Code\CourseSearchPanel_ListView.vb:line 1040
   at CustomControl.CourseSearchPanel_ListView.DoSearch() in C:\CompassCC\PS Web Enrolment\App_Code\CourseSearchPanel_ListView.vb:line 180
   at webcontrols_search.OnLoad(EventArgs e) in C:\CompassCC\PS Web Enrolment\webcontrols\search.ascx.vb:line 28
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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