[InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.]
Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value) +1113
system.doe.profiles.classes.profileshome.teacherpage.TeacherPageClass.getStaffingRetentionRates(ProfilesNavBean bProfiles) +2467
system.doe.profiles.classes.profileshome.teacherpage.TeacherPageClass.getTeacherPageContent(ProfilesNavBean bProfiles) +1527
Profiles_Teacher_Aspx.Page_Load(Object sender, EventArgs e) +2861
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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