Error is returned when start and end location are the same 

![image](https://user-images.githubusercontent.com/13739525/77860557-d805aa00-71c4-11ea-9802-8f3f4b2e1cb1.png)
![image](https://user-images.githubusercontent.com/13739525/77860567-dfc54e80-71c4-11ea-8cd6-34859be291fa.png)
![image](https://user-images.githubusercontent.com/13739525/77860572-e3f16c00-71c4-11ea-9abd-ee086abe87f9.png)
