[ns] xgraph error when plotting

[umair shah]

Hey I ran a script ,and xgraph ran and plotted the desired graph but I got this error ,anyone faimiliar with 
 XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":1.0"
      after 202 requests (193 known processed) with 0 events remaining.
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":1.0"
      after 298 requests (206 known processed) with 0 events remaining.
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":1.0"
      after 300 requests (207 known processed) with 0 events remaining.
? 
I had issues with xgraph in ubuntu 10.10 I installed it with synaptic manager ,Is there any environment variable problem,I need to take care of? i installed ns2 2.34 earliear ,got the error of xgraph ,and then did the above thing.