SOPC bugs

Hi,

I keep running into a little problem with SOPC builder producing the following Error!

no slave id!

at the

Making arbitration and system (top) modules.

stage of generation

I start with a simple design, as follows

1 interface to user logic.. an AHB master port.

1 AHB to avalon bridge

1 SDRAM controller

I can build this design.. with the interface to user logic connected my external logic.. and it works great.

but when I add a nios2f and some internal SRAM..

I get the error above?

If I delete the nios2 and sram... (ie back to where I started.)

I still get the error above...

Any clues as to why and what to do would be of great use!

Cheers