I have just finished making my first power supply. But when I tried to use it the potentiometer was burned. I tried different fixed resistors and all the resistors below 10k ohm gets burned. 

What seems to be the problem?

![schematic diagram](https://i.stack.imgur.com/ez9Sx.jpg)
![empty PCB - trace side photo](https://i.stack.imgur.com/ZqoSH.jpg)
![PCB layout diagram](https://i.stack.imgur.com/Rnkl0.jpg)
![populated PCB - top side photo](https://i.stack.imgur.com/M1INL.jpg)
![populated PCB - trace side photo](https://i.stack.imgur.com/NFVc1.jpg)