# Warning: Board breadboard:avr:atmega328bb doesn't define a 'build.board' prefere

**URL:** <https://forum.arduino.cc/t/warning-board-breadboard-avr-atmega328bb-doesnt-define-a-build-board-prefere/425484>\
**Category:** Programming\
**Created:** [December 17, 2016, 12:37pm UTC](https://forum.arduino.cc/t/warning-board-breadboard-avr-atmega328bb-doesnt-define-a-build-board-prefere/425484 "2016-12-17T12:37:40Z")\
**Posts on this page:** 1\
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**Author:** ![sineverba](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/sineverba/32/1189628_2.png) [@sineverba](https://forum.arduino.cc/u/sineverba)\
**Post date:** [December 18, 2016, 8:56pm UTC](https://forum.arduino.cc/t/warning-board-breadboard-avr-atmega328bb-doesnt-define-a-build-board-prefere/425484/3 "2016-12-18T20:56:54Z")

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I did try last (1.6.13), the previous (1.6.12), same warning.

I did try the 1.6.0 and won't compile the RF24 library.

Now downloading the 1.6.5.

Do you have some hint on which version? If I try to load a bootloader and sketch, there will be error or is it only a warning?

(with Arduino UNO no problem with loading sketchs).

Thank you

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