[ns] constructor failed

[Jianxue Huang <jhuang@sce.carleton.ca>]

Hi, everybody:

My NS worked well last week.  But today when try to use it, there is a 
strange problem.  When I start the NS with:

	set ns [new Simulator]
I got:
	class Simulator: constructor failed: invalid command name "Simulator"

Does anybody know what the problem is? and how to deal with it?

Thanks.

J. Huang