avrdude: verification error; content mismatch

Using Arduino Programming Questions
#1

I am getting this error while trying to upload my code onto a Makeblock Orion:

avrdude: verification error, first mismatch at byte 0x025e
0xea != 0xfa
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

I am an absolute beginner to Arduino and I have no idea what this means.

Any ideas on how to fix it?

#2

I fixed the issue. Port 5 needs to be unplugged in order to upload something onto the Orion

#3