What do I do here ?
Good question. This looks very strange. Is it a sketch? If yes then you should check your C/C++ syntax. Esp. the import lines. Then you declare a variable of type Arduino and in setup you assign a new object to the variable and so on. Seems like the Arduino software is not able to handle all the strange syntax and fails with an internal error. With only this excerpt of your code it his hard to guess what really happens.
@Masrek080 - that is a Processing sketch.
OP: You are telling the software to connect to the 2nd serial port in the list. Is that the one that your Arduino is connected to? What is loaded on the Arduino?
I fixed it now, thanks for getting back though.