added more detailed error message reporting.
added more detailed error message reporting.

kyroskoh/flann,kyroskoh/flann,kypp/flann,atulkum/flann,atulkum/flann,kyroskoh/flann,egtann/flann,egtann/flann,egtann/flann,saedrna/flann,saedrna/flann,kyroskoh/flann,atulkum/flann,kypp/flann,saedrna/flann,kypp/flann,atulkum/flann,kypp/flann,egtann/flann,kyroskoh/flann,atulkum/flann,saedrna/flann,saedrna/flann,atulkum/flann,kypp/flann,kypp/flann,egtann/flann,egtann/flann,saedrna/flann