Server Error in '/' Application.

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Line 263:        else if (SearchType == KEYWORD)
Line 264:        {
Line 265:            Walkingworld.CountyCollection _counties = Walkingworld.Lookups.GetAllRegions();
Line 266:            
Line 267:            Repeater_Walks_distance_county.DataSource = _counties;

[InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.String'.]
   WalkingworldLibrary.ListRegionsRow.get_regionText() +69

[StrongTypingException: The value for column 'regionText' in table 'ListRegions' is DBNull.]
   WalkingworldLibrary.ListRegionsRow.get_regionText() +124
   Walkingworld.Lookups.GetAllRegions() +173
   CMSWebParts_Walkingworld_DisplayWalkList.Page_Load(Object sender, EventArgs e) in d:\domains\walkingworld.com\httpdocs\CMSWebParts\Walkingworld\DisplayWalkList.ascx.cs:265
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   CMS.PortalControls.CMSAbstractWebPart.OnLoad(EventArgs e) +191
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627