Tell us about yourself!
I believe I understand the problem. It's the Arduino Uno Click Shield who creates short circuit.
I thank you all for the input and warnings about the law. I will take a deeper look into it.
would you mind elaborating?
We get classes about security and communications and testing, this happens to be apart of it. This way we learn how to make our programs better. This way we understand that side of the story better in order to be better programmers. I like to be clear on this subject. I do not have bad intentions with it. I just need to jam an nfc device, while everybody knows about it. All I want is that it might have a range of a bit more than 10 cm.
I've looked up on the laws of my country, and it seems the way it's used in this case it's not fully illegal here, but until I understand more about jammers I won't be 100% sure what part will be illegal and what part won't.