Error when uploading to MultiWii

[CVMichael]

I made changes to the config.h and then uploaded, and it worked fine. Then I realized that I did not plug the GPS in the board, and I wanted to disable the GPS for now and not use it... I modified the config.h and commented out the GPS defines, then I upload and got this error:

Binary sketch size: 28,824 bytes (of a 258,048 byte maximum)
avrdude: verification error, first mismatch at byte 0x6534
0x57 != 0x53
avrdude: verification error; content mismatch


So... first time worked, after that did not work anymore... I even tried to "undo", and upload the code with GPS the way it was when it worked, but I get the same error

[scrat]

You don't need to comment out defines for gps.

[CVMichael]

Thanks...

Also, I figured out that I need the battery to be plugged in my hexacopter while I upload the code to the MultiWii, and then I don't get any errors....