Hi Graham,
Well, it helps in the way that I now know that a PBP example IS included in the PK2 LPC-board example files. I managed to find the Eample files/Starter kit lessons including the PBP source file you mention but the Quick Start step you mention.

I don't have a PK2, I don't have a LPC-board and I don't use MPLAB so there are probably people more capable of helping you get this sorted than me.

From the error message it looks to me that the compiler (PBP) runs and compiles the code without error but for some reason the assembler MPASM doesn't. I've tried to compile and assemble the pk2_tutorial.bas file here (with MPASM from MPBLAB 8.56) and it works fine but I'm using MicroCodeStudio as my IDE and not MPLAB.

There's a note in the source file about replacing the 16F690.INC file, forgetting that should NOT prevent it from compile/assemble but it will likely prevent it from working once you get past the current problem.

I'm sorry I can't give you a definitive solution to your problem, I hope someone more used to MPLAB will step in and give you a nudge in the right direction.

/Henrik.