I don't know the answer but it is not a "Problem with flashing an Attiny84A-Pu" - it is a problem with compiling. I suspect you will get the same error if you just try to verify the program rather than to upload it.
...R
I don't know the answer but it is not a "Problem with flashing an Attiny84A-Pu" - it is a problem with compiling. I suspect you will get the same error if you just try to verify the program rather than to upload it.
...R