Can't upload to Arduino mega 2560

Hi bro, When I upload to Arduino mega2560, I have a problem like this: But it is ok on other computer or Arduino Uno. Please help me! thank bro!

That version is still a beta version. Try a stable version instead.

HugoPT:
That version is still a beta version.
Try a stable version instead.

I did. But it still doesn’t work

Important note: ALL DATA STRUCTURES are stored into SRAM! Also, I have stumbled upon it and I had to rewrite program. Check this: PROGMEM and F macro