You have to give path of database not name of database,
try with
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *path = [docsPath stringByAppendingPathComponent:@"stories_db.sqlite"];
FMDatabase *db = [FMDatabase databaseWithPath:path];
[db open];
FMResultSet *resultsFavorite = [db executeQuery:@"SELECT * from favorites"];