Can't Upload Repetier firmware to a ''Minitronics v1.1'' board

Right now i am Busy to build a 3D Printer, The ''Kossel K800 XL.'' I received a imitation from a
Arduino 2560 first that didint work, So i bought a Minitronics v1.1 board at the local store. My computer registered it as COM4. After that I modified the arduino software a little bit.

(I am a newbie with arduino)

The board runs with a ''Atmel/atmega1281'' processor so i had to change the ''Boards.txt'' right now i still can't use the Minitronics board. Here are the problems that Arduino shows to me


Arduino: 1.8.2 (Windows 8.1), Board:"Minitronics"

Warning: Board arduino:avr:uno doesn't define a 'build.board' preference. Auto-set to: AVR_UNO
Warning: Board arduino:avr:mega1281 doesn't define a 'build.board' preference. Auto-set to: AVR_MEGA1281
Warning: Board arduino:avr:megatronics doesn't define a 'build.board' preference. Auto-set to: AVR_MEGATRONICS
Warning: Board arduino:avr:mega2560 doesn't define a 'build.board' preference. Auto-set to: AVR_MEGA2560
Warning: Board arduino:avr:mega doesn't define a 'build.board' preference. Auto-set to: AVR_MEGA
C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino\wiring_digital.c: In function 'analogWrite':

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino\wiring_digital.c:162:9: error: 'TIMER1C' undeclared (first use in this function)

case TIMER1C:

^

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino\wiring_digital.c:162:9: note: each undeclared identifier is reported only once for each function it appears in

exit status 1
Fout bij het compileren van board Minitronics

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.


Can you guys please help me and tell me exactly what i need to do

Thanks in advance

-Kossel K800 XL https://www.aliexpress.com/snapshot/0.html?orderId=82465238197345&productId=32499612041

-Minitronics v1.1 https://reprapworld.nl/products/electronics/minitronics/minitronics_v1_1_basis_kit/

Which part of The board is compatible with Arduino and will therefor be easily programmed from the Modified Arduino IDE, which you can download in our software downloads section. We provide firmware that's ready to run with the board, but you need to adjust the settings or your machine. do you not understand?