PIC24F Bootloader- Unable to set "Preserve Program memory range" with Pickit3

[muthukural001]

Hello All,

I have been developing UART boot loader for My PIC24FJ128GB206 for past two days. As a reference for developing this, I used to read Application note "an1157" from microchip.And I modified the linker scripts shared in the http://www.microchip.com/forums/m656979.aspx for My MCU.For Reference, I attached the two linker scripts.


Well coming to the problem:

I will first load My bootloader and then test code like Led blinking.So, I need to preserve bootloader code from erasing.For this, I need to set Pickit 3 in MPLAB so that it will not erase them while flash LED blink code.

Here is how I am setting Pickit 3 for that:
               
             * Went to Properities->Pickit3->Memories to Program->Manually select Memories and Ranges
             *Selected "Manually select memories and ranges"
             *Checked "Configuration memory" and "Program memory"
             *Set "Program memory range" to 0x1400 - 0x157f7 as My boot loader code resides below 0x1400.
             *Checked "Preserve Program Memory"
   
Problem:
     *Tried to set "Preserve Program Memory range" to 0x00 - 0x13FF to prevent My Boot loader code from Overwriting.But, it is not allowing to set the range and the correspondig field shaded with "red" colour.
     *Also, tried to uncheck "Erase all Before Program". But, it was greyed out (disabled). 
         
    *Attached images of the errors and linkker scripts.