using prior random stimuli

[Gadi]

Hi,
I worked my way through the manual to create the attached procedure for a general memory test - a new/old test.

My goal is to use reuse randomly generated stimuli from block 1 in block 2.
Althogh I checked the drt's sample and it looks the same, drt displays text that it can not find the stimuli (I use v2008).
Also, is there any way that in block 2 i can add to the previously randomly generated stimuli from block 1, more random stimuli from the same type of stimuli but not those used in block 1?
Pleast let me know where is the failure in the attached.
Thanks,
Gadi