Updated My Previous main.py with error handling

[AadityaAwati]

Now the program won't error out every sing time and end immediatey. This was very irritating for me as when I was trying to improve it, every time I tested it, it would just end as soon as I touched the sensor, 90% of the time. Now it won't end immediately but will show the error message and start the program again. Now I can test it in peace on my Lenovo Laptop!