CreateChildControls_Exception: FormatException Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.Convert.ToInt32(String value) at Chillisoft.KnowledgeHubListWebPart.Utility.GetItem(String listName, String id) at Chillisoft.KnowledgeHubListWebPart.DocumentListQueryBuilder.GetOrConditionsForSelectedItems(String selectedItems, String listName, String searchString) at Chillisoft.KnowledgeHubListWebPart.DocumentListQueryBuilder.AddSubjectSearchClause(String query, String subjectSearch) at Chillisoft.KnowledgeHubListWebPart.DocumentListQueryBuilder.GetQuery(DocumentItemList documentItemListControl, Boolean includeAllTextSearch, Boolean mustIncludeWholeWord) at Chillisoft.KnowledgeHubListWebPart.DocumentItemList.GetQueryFoundItems(SPWeb web, Boolean includeAllFields, Boolean mustIncludeWholeWord) at Chillisoft.KnowledgeHubListWebPart.DocumentItemList.Initialise() at Chillisoft.KnowledgeHubListWebPart.KnowledgeHubListWebPart.CreateChildControls()