IAR debug with branch instruction error on FLASH

Hello,

I use IAR 4.41A with HJTAG v04.4.
I can debug my code without any problem in RAM and
I can program the flash and run the code but when I
want to debug my code in FLASH the debugger stop at every
branch instruction (B,BL,BLX,...) never go further.
and when I press Step Into in Debug Log window I can see this error:
____________________________________________________________________
[RDI Error: 148] No more breakpoints left for this type of memory
(RAM/ROM)
Sat Aug 11 20:33:21 2007: Unable to execute: driver error.
Sat Aug 11 20:33:22 2007: WinRDI Set break at address 0x00001340 failed
____________________________________________________________________
I don't use any breakpoint.so there is 2 breakpoint for IAR for debug.
I test the IAR example on LPC2148 from olimex.

Can anyone tell me where is the wrong?
I'm really confuse.
Thanks a lot.