Error while executing query

Error while executing query

I am using this code for executing query,
  2.  IReportClient RepClient = new ReportClient("1000.xxx", "xxx", refreshToken);
  3.                 //'Zoho CRM Analytics'
  4.                 //Enquiry , leads 
  5.                 string tableURI = RepClient.GetURI("xxx", "Zoho CRM Analytics", "Enquiry");
  6.                 Dictionary<string, object> resObj = RepClient.ExportDataAsDictionary(tableURI, "\"company\"='Utopia'", null);
  7.                 Object[] columns = (Object[])resObj["column_order"];
  8.                 Object[] rows = (Object[])resObj["rows"];
While executing ExportDataAsDictionary , I am getting error as ,

An unhandled exception of type 'ZReports.ServerException' occurred in ZohoReports.dll