This could be due to several reasons.  NetSim interacts with SUMO in runtime,  during VANET simulations. 

Both Python and pywin32 are required for VANET simulations to happen successfully. This is essential for interfacing NetSim with SUMO which is a python based road traffic simulator. 

  • Check if Python 2.7 pywin32-220 is installed in your PC from the control panel. 

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Note: It is always recommended to run VANET simulations in Admin mode, preferably under the Administrator user account.