Problems on displaying graphs

[Alessandro Perrone]

Hi all
 I have a little problem on displaying line graph.
Once the program is running the system says

*** event raised for error: InvalidCombination
ActiveGraph not initialized properly*** execution terminating due to error
IOT trap/Abort (core dumped)

And the code is this
  ourgraph = [EZGraph createBegin: [self getZone]];
  [ourgraph setTitle: "Per-capita GDP"];
  [ourgraph createSequence: "average GDP" withFeedFrom:[modelSwarm
getBugList]      andSelector: M(getA)];
  
  [ourgraph setAxisLabelsX: "# instances" Y: "% Successes"];
  ourgraph = [ourgraph createEnd];

Can anyone tell me what's wrong?
Best regards.                           ALEX


                  ==================================
   Swarm-Support is for discussion of the technical details of the day
   to day usage of Swarm.  For list administration needs (esp.
   [un]subscribing), please send a message to <address@hidden>
   with "help" in the body of the message.
                  ==================================