ns 3 - ./waf command not working -


i using ns-3.16 in ubuntu 12.04. i'm new python ns3. when run ./waf (or other waf command) produces following code: 

   waf: entering directory `/home/hp/ns-3.16-git-master/build' waf: leaving directory `/home/hp/ns-3.16-git-master/build' traceback (most recent call last):   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/scripting.py", line 97, in waf_entry_point     run_commands()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/scripting.py", line 151, in run_commands     run_command(cmd_name)   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/scripting.py", line 143, in run_command     ctx.execute()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/scripting.py", line 345, in execute     return execute_method(self)   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/build.py", line 98, in execute     self.execute_build()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/build.py", line 107, in execute_build     self.compile()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/build.py", line 182, in compile     self.producer.start()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/runner.py", line 149, in start     self.refill_task_list()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/runner.py", line 98, in refill_task_list     self.outstanding.extend(self.biter.next())   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/build.py", line 396, in get_build_iterator     self.post_group()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/build.py", line 380, in post_group     f()   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/extras/compat15.py", line 114, in post     return old_post(self)   file "/home/hp/ns-3.16-git-master/.waf-1.6.11-30618c54883417962c38f5d395f83584/waflib/taskgen.py", line 110, in post     v()   file "/home/hp/ns-3.16-git-master/src/wscript", line 436, in apply_ns3header     dst_node = ns3_dir_node.find_or_declare(src_node.name) attributeerror: 'nonetype' object has no attribute 'find_or_declare

how should troubleshoot this?

that's mean ns3_dir_node none. has no find_or_declare method. have @ script find why ns3_dir_node id none.


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