This exception is raised when a requested item cannot be found. This is most likely caused by using Ora_Nls.Get_Lang_Scalar to retrieve character information, or by using Ora_Nls.Get_Lang_Str to retrieve numeric information.
Ora_Nls.Not_Found EXCEPTION;
/*
** Hand the exception for an item that was not found
*/
EXCEPTION
WHEN Ora.Nls.Not_Found THEN
Text_IO.Put ('The item was not found, check calls to Get_Lang.');