Error when accessing the Attendance module in FAWeb

The error below is received when teachers attempt to enter attendance in FAWeb:

A Page Error occurred URL: http://d-2ub542013l/FAWeb7/Forms/FAWebShell.aspx Source:System.Data Error Message:A column named '2/7/2011' already belongs to this DataTable. Stack Trace: at System.Data.DataColumnCollection.RegisterColumnName(String name, DataColumn column, DataTable table) at System.Data.DataColumnCollection.BaseAdd(DataColumn column) at System.Data.DataColumnCollection.AddAt(Int32 index, DataColumn column) at System.Data.DataColumnCollection.Add(String columnName, Type type) at Blackbaud.Web.FE.FAWEB.Attendance.SetUpGridEx(Boolean bRefreshAfterSave) at Blackbaud.Web.FE.FAWEB.Attendance.LoadRemainingPage(Boolean bSkipClasses) at Blackbaud.Web.FE.FAWEB.Attendance.Page_Load(Object sender, EventArgs e)
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Environment

 7.82.104 patch 20

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