arduino uno upload problam

Arduino: 1.8.1 (Windows 7), Board: “Arduino/Genuino Uno”

Sketch uses 928 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: verification error, first mismatch at byte 0x0000
0xff != 0x0c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.

how to fixit this problan

  1. By posting it into the write board
  2. By doing what the error tells you, turn on verbose output!
  3. Give more details about you setup. What Arduino? Real or clone? Did it work before? etc