Hi I wrote a new router model. It worked good before I changed it a little in C++ and changed name of the router in Tcl. And when I running the tcl it gives me an error (_o85 cmd line 1) invoked from within "_o85 cmd link _o89" 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" $..." (procedure "_o85" line 2) (SplitObject unknown line 2) invoked from within "$q link [$link_($sid:$did) set link_]" (procedure "_o3" line 72) (Simulator simplex-link line 72) invoked from within "$ns simplex-link $node_bn $node_end $bottelneck 20ms MAPIIM " (file "multiflow_MAPIIM.tcl" line 41) I guess that tcl didn't even run the simulator and C++ code. What can be the problem ? Thank, Yuri