avrdude: verification error

Hi everyone !

I am a french guy so I am sorry for my english ...

I just buy a arduino starter kit. I am at the project 05 and I suddenly had this problem :

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

I don't understand what does that mean because I didn't do anything special and the last sketch I uploaded works.

I am on debian and arduino1.0.5. I tried with windows 7 and I had the same issue.

PS0: I have some problem to write english but I can totaly understand it.
PS1: I already make a post in starter kit session but I had no answer so if a moderator can remove it avrdude: verification error - The Arduino Starter Kit - Arduino Forum