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I have searched but have not found any solution to my problem so I am asking it here. I make a program in python that makes serial communication with the Arduino. I started to upload my Arduino code but I forgot that my python program was open in the terminal (I use Ubuntu). So, I think the Arduino code and python output went to the same port which the Arduino is on. After that I couldn't upload any code into the Arduino.
Every time it prints the following error:
avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
and then makes more 9 attempts. Any help?