unable to render graph for some elements

I need some direction as to where to look for some troubleshooting.
  I am still in the process of importing my WINNT cricket configs over to a linux box...
  before I did anything, I made sure that cricket on the linux box works by pointing it to a few sample devices.
  I have to import the NT configs over because of the sheer number of devices involved...
   
  I was trying it with a single cisco router to begin with....
  now, using the root "default" file that came with genRtrconfig and the router-folder default file that came from WINNT, I can see most graphs... 
   
  I can, for eg, see CPU status, but cant see the memory satus on the same router! I get an error saying "failed to draw graph. Check your server's log for details"...
  now, when i run collector, I can clearly see the info getting retrived.
   
  [21-Mar-2007 15:38:08 ] Retrieved data for cpu (): 0,0
[21-Mar-2007 15:38:08 ] Retrieved data for chassis (): 1
[21-Mar-2007 15:38:08 ] Retrieved data for processor (1): 5233004,62149696
[21-Mar-2007 15:38:09 ] Retrieved data for i-o (2): 2222528,31331904

   
  "processor" is the memory....
  target  processor
        display-name            =       "Processor"
        inst                    =       map(memory-pool-name)
        memory-pool-name        =       "Processor"
        short-desc              =       "Processor"
        target-type             = Cisco-Memory

  appreciate any pointers....
   

 
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