[ns] nam problem in ns2 it is urgent

sir, I am getting error when I am entered in root then type nam it gives error: "root@HP:/home/alok# nam Segmentation fault (core dumped)" plz solve this problem thank you

[ns] [CFP] Elsevier Ad Hoc Networks Journal [IF=1.94] -- SI on "Cognitive Radio based Smart Grid: The Future of the Traditional Electrical Grid"

Dear All, Please find below a call for papers for the Special Issue of the Elsevier Ad Hoc Networks Journal on "Cognitive Radio based Smart Grid: The Future of the Traditional Electrical Grid". Please accept our apologies if you receive multiple copies of this announcement. --- Call for

[ns] tcl script problem in ns2 it is urgent

when I am running below tcl file it gives again error :"Flow 1 starts at time 0.00 Segmentation fault (core dumped)" --mkc.tcl--- # create scheduler set ns [new Simulator] set f [open out.tr w] $