avrdude: verification error, first mismatch at byte 0x0000 0x00 != 0x0c

I'm trying to remap my makey makey and keep getting this error.

What am I doing wrong? Is it something to do with my ports? I only get one option in the port settings after I plug in the USB and that option is for COM3.

Thanks.

Sketch uses 8268 bytes (28%) of program storage space. Maximum is 28672 bytes.
Global variables use 593 bytes of dynamic memory.
Forcing reset using 1200bps open/close on port COM3
PORTS {COM3, } / {} => {}
PORTS {} / {} => {}
PORTS {} / {} => {}
PORTS {} / {} => {}
PORTS {} / {COM4, } => {COM4, }
Found upload port: COM4
C:\Users\winsp\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\winsp\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf -v -patmega32u4 -cavr109 -PCOM4 -b57600 -D -Uflash:w:C:\Users\winsp\AppData\Local\Temp\arduino_build_254030/makey2.ino.hex:i 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Users\winsp\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"

         Using Port                    : COM4
         Using Programmer              : avr109
         Overriding Baud Rate          : 57600
         AVR Part                      : ATmega32U4
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PA0
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  9000  9000 0x00 0x00
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0x00 0x00
           lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : butterfly
         Description     : Atmel AppNote AVR109 Boot Loader

Connecting to programmer: .
Found programmer: Id = "CATERIN"; type = S
    Software Version = 1.0; No Hardware Version given.
Programmer supports auto addr increment.
Programmer supports buffered memory access with buffersize=128 bytes.

Programmer supports the following devices:
    Device code: 0x44

avrdude: devcode selected: 0x44
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% -0.00s

avrdude: Device signature = 0x1e9587 (probably m32u4)
avrdude: reading input file "C:\Users\winsp\AppData\Local\Temp\arduino_build_254030/makey2.ino.hex"
avrdude: writing flash (8268 bytes):

Writing | ################################################## | 100% 0.07s

avrdude: 8268 bytes of flash written
avrdude: verifying flash memory against C:\Users\winsp\AppData\Local\Temp\arduino_build_254030/makey2.ino.hex:
avrdude: load data flash data from input file C:\Users\winsp\AppData\Local\Temp\arduino_build_254030/makey2.ino.hex:
avrdude: input file C:\Users\winsp\AppData\Local\Temp\arduino_build_254030/makey2.ino.hex contains 8268 bytes
avrdude: reading on-chip flash data:

An error occurred while uploading the sketch
Reading | ################################################## | 100% 0.07s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
         0x00 != 0x0c
avrdude: verification error; content mismatch

avrdude done.  Thank you.