[ns] RMST source publish or start

[Anas]

Dear NS users i am trying to use rmst in diffusion to send my data
through my wireless sensor network 
I have build my network but i am having problem in making the source
starting to publish 
when i put "src publish" i get the following error plz help 
ns: _o98 publish: 
    (_o98 cmd line 1)
    invoked from within
"_o98 cmd publish"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o98" line 2)
    (SplitObject unknown line 2)
    invoked from within
"_o98 publish"




Thanx for any suggestions