Lpc2000

Hi,

I'm struggling with IAP of the LPC2138. I got some program
examples, but all fail . I'm getting  0x0000000C (prefetch aboard)
during execution  of

iap_entry (command,result);

As far as I can verify command and result are correct, 
as well as the address of IAP_LOCATION.

Could sombody advice or guess what's going wrong , please?

Thank you .