[ns] LEACH error

[rupcee kaur]

Hello NS- users,

I am getting the following error in leach.out file in the middle of running the 
LEACH protocol.
ns: _o1082 checkAlive: 
    (_o12 cmd line 1)
    invoked from within
"_o12 cmd removeif _o1087"
    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" $..."
    (procedure "_o12" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$chan removeif [[$self node] set netif_(0)]"
    (procedure "_o1082" line 13)
    (Application/LEACH checkAlive line 13)
    invoked from within
"_o1082 checkAlive"  

Please suggest me any possible solution why is this occuring?

Thank you in advance.