Error when upload my code

i am facing a problem when i want to upload my aduino code
error is :

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

please can anyone help me

Thank you

On the Arduino software, make sure you go to the Tools menu, then select "Board". Verify that the selected board you've chosen is for the specific Arduion board you are trying to program.

thank you for your reply

i did all the connection , board arduino uno and serial port
and still this error shown when i uploading my code