Optiloader Mega2560 support

Hi,

Strangely,
i can compile and upload the optiloader sketch.
but, in the case of the Adaloader project i can only compile, when i try to upload, it gives me this error message:

Binary sketch size: 28688 bytes (of a 32256 byte maximum)

avrdude: stk500_paged_write(): (a) protocol error, expect=0x14, resp=0x64
avrdude: failed to write flash memory, rc=-4
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

Does anyone has any idea of what might be the problem? I´m using Arduino UNO.