please explain to me what the error means. thank you so much!
Don't thank me yet. The answer to your question has a hint of sarcasm (but it's the only answer anyone can provide at this point)...
avrdude: stk500_paged_write(): (a) protocol error, expect=0x14, resp=0x64
The error means exactly what it says. avrdude was attempting to write (hence the "stk500_paged_write"). While attempting to write, it expected the programmer to respond with 0x14 but instead received 0x64.
Do you program the robot through a bootloader installed on the robot or through an in-system program (aka "ISP" aka "ICSP")?