My BPPC doesn't recognize 256 MB - Why?

[Daniele]

I have bought a second 128 MB stick from AmigaKit but it

doesn't work on my BPCC 150 MHZ , if I add 64 MB to the

other 128 it works but if I add 128 MB to the 128 MB to

have 256 MB nothing to do!!! Why?

Help me please

[Daniele]

I tested them alone and the work. But I cannot get working both at the same time!