I got an error while running my code

My code includes three link of same distance and I'm using routing protocol DV

when I run the code I got the following error:
ns: _o222 unknown-flow 13 10 0:
(_o222 cmd line 1)
invoked from within
"_o222 cmd unknon-flow 13 10 0"
"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 "_o222" line 2)
(SplitObject unknown line 2)
invoked from within 
"_o222 unknown flow 13 10 0"


but when I take out the routing protocol command the NAM window opens but there 
is no traffic flow.......

Please help me in this error I'm using ns2.31



      

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