[ndnSIM] the Use about ndn::LinkControlHelper

[许亚平]

Dear Sirs,
    The email is about ndnSIM Helper.I'm a beginner for ndnSIM and NDN.At present,I meet some problems when I use ndn::LinkControlHelper.I write a program about faillink and uplink of some nodes.However ,when the simulation starts ,it makes error.As shown in the figure below.



Some parts of my program show in the below:



What the reason is?I hope to know the answer in a hurry.
I look forward to hearing from you soon.
Thankyou!
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