I keep getting the same error on datamarts (The field 'Hidden' of the record wasn't found) when I try to save my query. I've removed all of the steps that are automatically generated for hidden files. It only seems to happen when I add a speicifc query but the file it mentions on the error message is not being used by the query at all, it's just in the same sharepoint folder. The query itself doesnt return any error when it is opened. The problem only happens when saving the datamart. I've tried to filter to only the specific file I want before expanding it but the error is the same.
ErrorMessageExpression.Error: The field 'Hidden' of the record wasn't found. Content = <ccon>error "Microsoft.Mashup.Engine1.Runtime.ValueException: [Expression.Error] Value was not specified.#(cr)#(lf) at Microsoft.Mashup.Engine1.Language.ValueCreator.CreateValueForNotImplemented(INotImplementedExpression expression)#(cr)#(lf) at Microsoft.Mashup.Engine1.Language.ValueCreator.<>c__DisplayClass23_0.<CreateValueForRecord>b__0(Int32 index)#(cr)#(lf) at Microsoft.Mashup.Engine1.Runtime.RecordValue.DemandRecordValue.get_Item(Int32 index)#(cr)#(lf) at Microsoft.Data.Mashup.ProviderCommon.MashupResource.TryGetValue(Func`1 getValue, IValue& value, String& errorMessage)#(cr)#(lf)Record"</ccon>,