Can't upload my code to arduino

Hello, I’m having this problem when I’m uploading my code to my arduino nano.

avrdude: verification error, first mismatch at byte 0x0000
0x62 != 0x0c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

Can anyone tell me the problem? Thank you

What's your code? What OS are you using? On Windows, a reboot sometimes fixes COM issues...

Verify that you have the correct driver installed for the board.

goto tools>board>Arduino nano

tools>port>com????? verify that this is correct

tools>processor> ATMega328p(oldBootloader)

tools>programmer>arduinoISP.org is the one I use

The Tools > Programmer menu selection only matters when you are doing Tools > Burn Bootloader or Sketch > Upload Using Programmer. If you are doing a standard Upload, the Tools > Programmer menu selection is completely ignored so it doesn't matter what you have that set to.