Why CursorWindow column is equal to -1?

I an trying to run my first database connected program and here is the problem that I face.

Couldn't read row 0, col -1 from CursorWindow. 

This is the error that I get when showData() function is called which I guess means that it is trying to get the the first elements value from row 0 and column -1.

Why do it starts from - 1 and how to make it start from column = 1 http://ift.tt/1BY3OTb (here is the whole code part)