[ndnSIM] Modulenotfounderror:'DOXYGEN'

[sai gautams]

I tried following the step b step procedure to install the ndnSIM but this
error shows up constantly. Any help in solving this would be
much appreciated.
Thank you.

./waf --run=ndn-simple
Traceback (most recent call last):
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Scripting.py",
line 119, in waf_entry_point
    run_commands()
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Scripting.py",
line 178, in run_commands
    parse_options()
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Scripting.py",
line 158, in parse_options
    ctx.execute()
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Options.py",
line 198, in execute
    super(OptionsContext,self).execute()
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 85, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 126, in recurse
    user_function(self)
  File "/home/smandapati/ndnSIM/ns-3/wscript", line 256, in options
    opt.recurse('src')
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 126, in recurse
    user_function(self)
  File "/home/smandapati/ndnSIM/ns-3/src/wscript", line 51, in options
    opt.recurse(module, mandatory=False)
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 126, in recurse
    user_function(self)
  File "/home/smandapati/ndnSIM/ns-3/src/ndnSIM/wscript", line 21, in
options
    tooldir=['%s/ndn-cxx/.waf-tools' % opt.path.abspath()])
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 80, in load
    module=load_tool(t,path,with_sys_path=with_sys_path)
  File
"/home/smandapati/ndnSIM/ns-3/.waf3-2.0.18-ff4ae9f5cc05353d3dc3aeff8854ae69/waflib/Context.py",
line 373, in load_tool
    __import__(tool)
ModuleNotFoundError: No module named 'doxygen'
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