Seems like there is probably an error in your case file. My guess is that some of the bus numbers are not positive integers.
Ray
> On Aug 13, 2016, at 5:31 AM, siddique tomal <[email protected]> wrote:
>
> Dear ,
> I'm having the following error when trying to run a program for any IEEE bus
> system. What's the cause behind it? If you want i can provide more
> information but the i need is the solution . <email_the_problem.JPG>
> ​waiting to hear from you
