Not sure what this error means.   The form and list module seems to be working OK, but now after upgrading to DNN 5.2, I get this error in event log.

AssemblyVersion: 5.2.0
PortalID: 0
PortalName: MySite
UserID: 114
UserName: snalerf
ActiveTabID: 161
ActiveTabName: Page3
RawURL: /Page3.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.mysite.com/Home.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 8b74ed82-817b-4811-adf2-cfba0e07d198
InnerException: The given key was not present in the dictionary.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.ThrowHelper.ThrowKeyNotFoundException
StackTrace:
Message: 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 DotNetNuke.Modules.UserDefinedTable.UserDefinedTableController.BuildMainDataSet(DataTable fieldsTable, IDataReader dr, Boolean RowMode) at DotNetNuke.Modules.UserDefinedTable.UserDefinedTableController.GetDataSet(Boolean WithPreRenderedValues) at DotNetNuke.Modules.UserDefinedTable.List.get_DataSet() at DotNetNuke.Modules.UserDefinedTable.List.SearchManager.LoadColumns() at DotNetNuke.Modules.UserDefinedTable.List.SearchManager.SearchControl(SearchControlTypes ControlType) at DotNetNuke.Modules.UserDefinedTable.List.SearchManager.LoadControls() at DotNetNuke.Modules.UserDefinedTable.List.Page_Init(Object sender, EventArgs e)
Source:
Server Name: WEB22