Hi
I'm not familiar with python, I just want to check something so I tried to run a .py code in linux so I wrote :

./waf wifi-olsr-flowmon --plot

which is a .py program after that whatever I want to run just see these error:

/home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/wscript: error: Traceback (most recent call last):
  File "/home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/.waf-1.5.16-e6d03192b5ddfa5ef2c8d65308e48e42/wafadmin/Utils.py", line 197, in load_module
    exec(compile(code,file_path,'exec'),module.__dict__)
  File "/home/bahar/Desktop/ns/ns-allinone-3.9/ns-allinone-3.9/ns-3.9/wscript", line 32, in <module>
    import cflags # override the build profiles from waf
ImportError: No module named cflags       

I dont know what does it mean or why it happened, would you please tell me what is the problem .
Bests