title: avr:atmega328bb doesn't define a 'build.board' preference. Auto-set to: AVR_ATMEGA328BB error in arduino bootloading
body: <p>I am using arduino uno to bootload atmega-328p . I have done all connections properly as shown in arduino.cc site . But then a warning give arduino ide that</p>
  
  <p>board avr:atmega328bb doesn't define a 'build.board' preference. Auto-set to: AVR_ATMEGA328BB</p>
  
  <p>I have changed my ide's preferrence.txt as
  build.board = AVR_ATMEGA328BB</p>
  
  <p>After that also the error is showing . I am using arduino ide on windows.
  What wrong I am doing ?</p>