I had the same problem recently with the same error message.  I spent =20
hours troubleshooting the causes listed in the MPLab and Pickit3 =20
manuals.

Somehow I had been using the "Program" selection under the =20
"Programmer" pull down rather than the the "Program" selection under =20
the Debugger pulldown.

Dave


On Oct 22, 2011, at 10:58 AM, jana1972@centrum.cz wrote:

> I have this very simple program
>
>
>
> #include <p18F45k20.inc>
> CONFIG FOSC =3D INTIO7
> =09
> 	org 0
> Start:
> 	BSF STATUS,1; select Register Bank 1
> 	BCF TRISD,0 ; make IO Pin RD0 an output
> 	BCF STATUS,0; back to Register Bank 0
> 	BSF PORTD,0 ; turn on LED RD0 (DS0)
>
> 	END
>
> I use PICkit3 for programming  and also I would like  for  debugging
>
> Program works, LED is ON, but I can not debug it.
> I receive the error
>
> PK3Err0040: The target device is not ready for debugging.
> Please check your configuration bit settings and program
> the device before proceeding
>
> Can anyone help?
> Thanks
>
> L.
>
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