Programmer not responding

Development Tools IDE 1.x
1

Hello all,
i'm using arduino due board with 84MHZ..initially during my trials it was working good and program was also uploaded into the board.

but suddenly in my sketch,selected board is changed and i'm not able to upload the program even if i change the board name to arduino due.

please help me...

the message are shown like this:

Build options changed, rebuilding all
Sketch uses 5106 bytes (16%) of program storage space. Maximum is 30720 bytes.
Global variables use 37 bytes (1%) of dynamic memory, leaving 2011 bytes for local variables. Maximum is 2048 bytes.
C:\Users\samsung\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/bin/avrdude -CC:\Users\samsung\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -carduino -PCOM13 -b57600 -D -Uflash:w:C:\Users\samsung\AppData\Local\Temp\arduino_build_759450/without_accel.ino.hex:i

avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is "C:\Users\samsung\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf"

Using Port : COM13
Using Programmer : arduino
Overriding Baud Rate : 57600
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x84

2

You have selected a board that is not the Due - it looks like you've got a nano or pro mini or something selected.

You need to select the Arduino Due from the tools -> board menu.

Why can you not select the Arduino Due?

3

thanx for suggestion... but it is written on board that arduino DUE and it is having processor IC SAM3X8E....it is checked on arduino web.